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1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 1
Powertrain Management: Electrical Diagrams
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 2
Electronic Control Module (ECM) Inputs
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 3
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 4
Electronic Control Module (ECM) Inputs
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 5
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 6
Powertrain Control Module (PCM) Inputs
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 7
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 8
Powertrain Control Module (PCM) Inputs
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 9
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 10
Electronic Control Module (ECM) Outputs
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 11
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 12
Electronic Control Module (ECM) Outputs
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 13
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 14
Powertrain Control Module (PCM) Outputs
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 15
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 16
Powertrain Control Module (PCM) Outputs
Without 4L60E/4L80E Automatic Transmission
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 17
ECM Wiring Diagram (Part 1 Of 4)
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 18
ECM Wiring Diagram (Part 2 Of 4)
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 19
ECM Wiring Diagram (Part 3 Of 4)
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 20
ECM Wiring Diagram (Part 4 Of 4)
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 21
92 C/K Fuel W/HD Auto.
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 22
92 C/K Fuel W/HD Auto.
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 23
92 C/K Fuel W/O HD Auto.
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 24
92 C/K Fuel W/O HD Auto.
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 25
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 26
Hot Fuel Handling 5.7L VIN K (RPO LO5)
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 27
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 28
Ignition System
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 29
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 30
Torque Converter Clutch
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 31
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 32
Four-Wheel Drive
TSB #76-43-01A1. Remove the front differential carrier shield, if equipped.
2. If necessary, clean the axle housing in the area around the existing actuator. Disconnect the actuator's electrical connection at the front axlehousing.
3. Remove the front axle actuator by unthreading the actuator from the axle housing.
4. Install the spacer from the wiring kit into the axle tube with the flat side seated against the shift fork.
5. Install the actuator motor and tighten until the shoulder of the actuator seats against the axle tube.
Important: If binding occurs before the actuator is seated, remove the actuator and reseat the spacer by pushing on the spacer with a screwdriver. Thenreinstall the actuator.
On K3 Models with the cast iron axle tube, there may be a casting burr which may contact the edge of the actuator. This should not create aconcern and the actuator should seat against the axle tube. If this contact remains a concern, use a die grinder in order to remove the burr.
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 33
6. Connect the service harness connector to the actuator and connect the 2-pin connector to the mating connector at the axle. For 1994 to currentmodels, in the case of a complete axle replacement, refer to Figure 1.
7. Route the wiring harness along the existing harness on the right side of the vehicle. Route CKT 241 (BRN) over the top and to the left of thetransmission. Secure the harness using plastic ties.
8. For 1995-97 interim vehicles, locate the 4-wire connector (C120) on the left side of the transmission. Splice the BRN wire of the actuator harnessinto cavity D of CKT 241 (BRN) on the engine side of connector C120. Follow the splicing procedure described in Section 8A (ElectricalDiagnosis Repair Procedures) of the applicable Service Manual.
Important:The new Fast Axle Actuator requires only 1 splice.
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 34
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 35
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 36
^ For 1993 and prior vehicles, splice into CKT 50 (BRN) between connector C152 and GT101 (Figures 2, 3, 4).
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 37
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 38
^ For 1994 vehicles, splice into CKT 50 (BRN) between connector C152 and P101 (Figures 5, 6).
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 39
^ For 1995-97 vehicles, splice into CKT 241 (BRN) between connectors C120 and C100 (Figure 7).
Notice:Connections must be water tight in order to prevent water from entering the circuit and causing damage to the components.
9. On K3 models, install the delay relay, included as part of the wiring harness kit, at the engine side of the bulkhead, adjacent to the existing relay.Mount the new relay with self-drilling fastener, P/N 22510339. Route and secure the relay wire harness behind the right oxygen sensor heatshield.
10. Verify system operation. When shifting the transfer case, you should hear the actuator motor operate.
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 40
Important:This relay incorporates a 5 second delay for the front axle to engage in order to allow the transfer case synchronizer to energize.
For 88-93 vehicles, if the axle has to be replaced, use jumper harness P/N 15313272. CKT 1695 (BLK/WHT) fits into cavity A of the fastactuator. The circuit includes the cable seal and the terminal pin. This circuit plugs into the 5-pin axle actuator connector.
11. Do the following steps in order to install jumper harness P/N 15313272:
a. Locate the axle actuator 5-pin connector on the service actuator wiring harness and remove the TPA.
b. Remove and discard the cavity plug from cavity A.
c. Install CKT 1695 lead (BLK/WHT) from the jumper harness that has the cable seal and terminal into axle actuator connector cavity A.
d. Reinstall the TPA on the 5-pin connector.
e. Install the service actuator harness 5-pin connector into the axle actuator.
f. Connect jumper harness 2x2 connector into the existing vehicle 4WD mating connector.
g. Strap the jumper harness and the service harness to the tab on the axle tube.
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 41
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 42
Four-Wheel Drive
TSB #76-43-01A1. Remove the front differential carrier shield, if equipped.
2. If necessary, clean the axle housing in the area around the existing actuator. Disconnect the actuator's electrical connection at the front axlehousing.
3. Remove the front axle actuator by unthreading the actuator from the axle housing.
4. Install the spacer from the wiring kit into the axle tube with the flat side seated against the shift fork.
5. Install the actuator motor and tighten until the shoulder of the actuator seats against the axle tube.
Important: If binding occurs before the actuator is seated, remove the actuator and reseat the spacer by pushing on the spacer with a screwdriver. Thenreinstall the actuator.
On K3 Models with the cast iron axle tube, there may be a casting burr which may contact the edge of the actuator. This should not create aconcern and the actuator should seat against the axle tube. If this contact remains a concern, use a die grinder in order to remove the burr.
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 43
6. Connect the service harness connector to the actuator and connect the 2-pin connector to the mating connector at the axle. For 1994 to currentmodels, in the case of a complete axle replacement, refer to Figure 1.
7. Route the wiring harness along the existing harness on the right side of the vehicle. Route CKT 241 (BRN) over the top and to the left of thetransmission. Secure the harness using plastic ties.
8. For 1995-97 interim vehicles, locate the 4-wire connector (C120) on the left side of the transmission. Splice the BRN wire of the actuator harnessinto cavity D of CKT 241 (BRN) on the engine side of connector C120. Follow the splicing procedure described in Section 8A (ElectricalDiagnosis Repair Procedures) of the applicable Service Manual.
Important:The new Fast Axle Actuator requires only 1 splice.
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 44
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 45
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 46
^ For 1993 and prior vehicles, splice into CKT 50 (BRN) between connector C152 and GT101 (Figures 2, 3, 4).
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 47
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 48
^ For 1994 vehicles, splice into CKT 50 (BRN) between connector C152 and P101 (Figures 5, 6).
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 49
^ For 1995-97 vehicles, splice into CKT 241 (BRN) between connectors C120 and C100 (Figure 7).
Notice:Connections must be water tight in order to prevent water from entering the circuit and causing damage to the components.
9. On K3 models, install the delay relay, included as part of the wiring harness kit, at the engine side of the bulkhead, adjacent to the existing relay.Mount the new relay with self-drilling fastener, P/N 22510339. Route and secure the relay wire harness behind the right oxygen sensor heatshield.
10. Verify system operation. When shifting the transfer case, you should hear the actuator motor operate.
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 50
Important:This relay incorporates a 5 second delay for the front axle to engage in order to allow the transfer case synchronizer to energize.
For 88-93 vehicles, if the axle has to be replaced, use jumper harness P/N 15313272. CKT 1695 (BLK/WHT) fits into cavity A of the fastactuator. The circuit includes the cable seal and the terminal pin. This circuit plugs into the 5-pin axle actuator connector.
11. Do the following steps in order to install jumper harness P/N 15313272:
a. Locate the axle actuator 5-pin connector on the service actuator wiring harness and remove the TPA.
b. Remove and discard the cavity plug from cavity A.
c. Install CKT 1695 lead (BLK/WHT) from the jumper harness that has the cable seal and terminal into axle actuator connector cavity A.
d. Reinstall the TPA on the 5-pin connector.
e. Install the service actuator harness 5-pin connector into the axle actuator.
f. Connect jumper harness 2x2 connector into the existing vehicle 4WD mating connector.
g. Strap the jumper harness and the service harness to the tab on the axle tube.
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 51
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 52
Four-Wheel Drive
TSB #76-43-01A1. Remove the front differential carrier shield, if equipped.
2. If necessary, clean the axle housing in the area around the existing actuator. Disconnect the actuator's electrical connection at the front axlehousing.
3. Remove the front axle actuator by unthreading the actuator from the axle housing.
4. Install the spacer from the wiring kit into the axle tube with the flat side seated against the shift fork.
5. Install the actuator motor and tighten until the shoulder of the actuator seats against the axle tube.
Important: If binding occurs before the actuator is seated, remove the actuator and reseat the spacer by pushing on the spacer with a screwdriver. Thenreinstall the actuator.
On K3 Models with the cast iron axle tube, there may be a casting burr which may contact the edge of the actuator. This should not create aconcern and the actuator should seat against the axle tube. If this contact remains a concern, use a die grinder in order to remove the burr.
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 53
6. Connect the service harness connector to the actuator and connect the 2-pin connector to the mating connector at the axle. For 1994 to currentmodels, in the case of a complete axle replacement, refer to Figure 1.
7. Route the wiring harness along the existing harness on the right side of the vehicle. Route CKT 241 (BRN) over the top and to the left of thetransmission. Secure the harness using plastic ties.
8. For 1995-97 interim vehicles, locate the 4-wire connector (C120) on the left side of the transmission. Splice the BRN wire of the actuator harnessinto cavity D of CKT 241 (BRN) on the engine side of connector C120. Follow the splicing procedure described in Section 8A (ElectricalDiagnosis Repair Procedures) of the applicable Service Manual.
Important:The new Fast Axle Actuator requires only 1 splice.
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 54
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 55
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 56
^ For 1993 and prior vehicles, splice into CKT 50 (BRN) between connector C152 and GT101 (Figures 2, 3, 4).
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 57
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 58
^ For 1994 vehicles, splice into CKT 50 (BRN) between connector C152 and P101 (Figures 5, 6).
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 59
^ For 1995-97 vehicles, splice into CKT 241 (BRN) between connectors C120 and C100 (Figure 7).
Notice:Connections must be water tight in order to prevent water from entering the circuit and causing damage to the components.
9. On K3 models, install the delay relay, included as part of the wiring harness kit, at the engine side of the bulkhead, adjacent to the existing relay.Mount the new relay with self-drilling fastener, P/N 22510339. Route and secure the relay wire harness behind the right oxygen sensor heatshield.
10. Verify system operation. When shifting the transfer case, you should hear the actuator motor operate.
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 60
Important:This relay incorporates a 5 second delay for the front axle to engage in order to allow the transfer case synchronizer to energize.
For 88-93 vehicles, if the axle has to be replaced, use jumper harness P/N 15313272. CKT 1695 (BLK/WHT) fits into cavity A of the fastactuator. The circuit includes the cable seal and the terminal pin. This circuit plugs into the 5-pin axle actuator connector.
11. Do the following steps in order to install jumper harness P/N 15313272:
a. Locate the axle actuator 5-pin connector on the service actuator wiring harness and remove the TPA.
b. Remove and discard the cavity plug from cavity A.
c. Install CKT 1695 lead (BLK/WHT) from the jumper harness that has the cable seal and terminal into axle actuator connector cavity A.
d. Reinstall the TPA on the 5-pin connector.
e. Install the service actuator harness 5-pin connector into the axle actuator.
f. Connect jumper harness 2x2 connector into the existing vehicle 4WD mating connector.
g. Strap the jumper harness and the service harness to the tab on the axle tube.
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 61
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 62
Transmission Control Module (TCM) Inputs
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 63
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 64
Transmission Control Module (TCM) Inputs
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 65
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 66
Transmission Control Module (TCM) Outputs
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 67
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 68
Transmission Control Module (TCM) Outputs
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 69
1992 Chevy Truck Blazer Full Size V8-350 5.7L Copyright © 2013, ALLDATA 10.52 Page 70
Vehicle Speed Sensor Buffer
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