1-secm-03-81.pdf - ddcsn. · pdf fileddec iii/iv single ecm troubleshooting guide ... figure...

81 FLASH CODE 81 – OIL LEVEL, EXHAUST TEMP,EGR TEMP OR EGR DELTA-PRESSURE, CIRCUITFAILED HIGH

Section Page

81.1 DESCRIPTION OF FLASH CODE 81 ..................................................... 81-3

81.2 SAE J1587 EQUIVALENT CODE FOR FLASH CODE 81 ....................... 81-3

81.3 TROUBLESHOOTING FLASH CODE 81 ................................................ 81-3

81.4 TROUBLESHOOT MAINTENANCE ALERT SYSTEM ............................ 81-7

81.5 TROUBLESHOOT EXHAUST GAS TEMPERATURE ............................ 81-10

(Rev. 2/03) All information subject to change without notice.

81-2 From Bulletin 1-SECM-03 6SE497 0207 Copyright © 2003 DETROIT DIESEL CORPORATION

DDEC III/IV SINGLE ECM TROUBLESHOOTING GUIDE

81.1 DESCRIPTION OF FLASH CODE 81

Flash Code 81 is used to identify oil level or exhaust temperature voltage high.

Flash Code 81 is also used to identify EGR Delta-pressure circuit high and EGR temperaturecircuit high.

For all EGR related codes, always perform the basic checks in EGR-1. Refer to section 10.16 forSeries 50. Refer to section 10.18 for Series 60.

81.2 SAE J1587 EQUIVALENT CODE FOR FLASH CODE 81

The SAE J1587 equivalent code for Flash Code 81 is p 98/3, oil level sensor input voltage high;155 or 411/3, EGR Delta-P circuit failed high and 154 or 412/3, EGR temperature circuit failedhigh; p 173/3, exhaust gas temperature circuit failed high.

81.3 TROUBLESHOOTING FLASH CODE 81

The following procedure will troubleshoot Flash Code 81. For code s 155 or 411,refer to section 81.3.1; for code s 154 or 412, refer to section 81.3.3.

For troubleshooting code 98/3, refer to section 81.4.1.

For troubleshooting code p 173/3, exhaust gas temperature circuit failed high,refer to section 81.5.1.

81.3.1 Check for Open

Perform the following steps to check for an open.

1. Unplug the engine sensor harness 30–pin connector.

2. Unplug the EGR Delta-Pressure sensor.

All information subject to change without notice. (Rev. 2/03)

6SE497 0207 Copyright © 2003 DETROIT DIESEL CORPORATION From Bulletin 1-SECM-03 81-3


3. Install a jumper wire between cavities Y2 and M2 at the EGR Delta-Pressure sensor.See Figure 81-1.

Figure 81-1 EGR Delta-Pressure Sensor Wiring

4. Measure resistance between P/N: 23527349, Series 60 or Series 50 – cavity 1 and 2.Measure resistance between P/N: 23531964 – cavity 2 and 3. See Figure 81-1.

[a] If the resistance measurement is less than or equal to 5 , Refer to section 81.3.2.

[b] If the resistance measurement is greater than 5 , circuit #452 is open. Repair andverify. Refer to section 81.3.5.

81.3.2 Check for Short

Perform the following steps to check for short:

1. Remove the jumper wire.

2. Measure resistance between P/N: 23531964 or Series 50 – cavity 1 and 3. Measureresistance between P/N: 23527349 – cavity 2 and 3. See Figure 81-1.

[a] If the resistance measurement is less than 1.5 k , circuit #416 is shorted to #958.Repair and verify. Refer to section 81.3.5.

[b] If the resistance measurement is equal to 1.5 k , replace the EGR sensor and go to81.3.5.





Perform the following steps to check for an open.

1. Disconnect the EGR temperature sensor.

2. Install a jumper wire between cavities A and B. See Figure 81-2.

Figure 81-2 EGR Temperature Sensor Wiring

3. Disconnect the engine sensor harness 30–pin connector.

4. Measure resistance between R1 and Y2. See Figure 81-2.

[a] If the resistance measurement is less than or equal to 5 , Refer to section 81.3.4.

[b] If the resistance measurement is greater than 5 , circuit #907 or #452 is open.Repair and verify. Refer to section 81.3.5.






1. Remove jumper wire.

2. Measure resistance between W1 and R1. See Figure 81-2.

[a] If the resistance measurement is less than 1.5 k , circuit #416 is shorted to #907.Repair and verify. Refer to section 81.3.5.

[b] If the resistance measurement is greater than 1.5 k , the resistor has failed. Repairand verify. Refer to section 81.3.5.

[c] If the resistance measurement is equal to 1.5 k , replace the EGR temperature sensor.

81.3.5 Verify Repair

Perform the following steps to verify repairs.

1. Connect all connectors.

2. Start and run the engine.

3. Road test the engine.

[a] If code 81 was not logged, no further troubleshooting is required.

[b] If code 81 was logged, please review this section from the first step to find the error.Refer to section 81.3.1. If this is the second time through the procedure, call DetroitDiesel Technical Service, or try a test ECM.




81.4 TROUBLESHOOT MAINTENANCE ALERT SYSTEM

The following procedures troubleshoot the Maintenance Alert System.

81.4.1 Multiple Code Check

Perform the following steps to check for multiple codes:

1. Turn ignition ON.

2. Plug in DT (diagnostic tool).

3. Read active codes.

4. Turn ignition OFF.

[a] If code 98/3 displays with code s 232/0, troubleshoot s 232/0 first.

[b] If code 98/3 displays, refer to section 81.4.2.

81.4.2 Check Connectors

Perform the following steps to check the connectors:

1. Unplug the oil level sensor (OLS).

2. Turn ignition ON.

3. Read codes.

[a] If code 98/4 displays, check connectors for open, damage or unseated conditions.Refer to section 81.4.3.

[b] If code 98/3 displays, refer to section 81.4.4.

81.4.3 Sensor Check

Perform the following steps to replace the sensor:

1. Replace the oil level sensor (OLS).

2. Verify the repair. Refer to section 81.4.6.



81.4 TROUBLESHOOT MAINTENANCE ALERT SYSTEM



1. Measure resistance between pin B and pin C of the OLS. See Figure 81-3.

[a] If the reading is less than 10 , cavity #416 is shorted to cavity #976. Repair the shortor replace the harness and verify the repair. See Figure 81-3. Refer to section 81.4.6.

[b] If the reading is greater than 10 , refer to section 81.4.5.

Figure 81-3 Oil Level Sensor





Perform the following steps to check for open:

1. Unplug the engine sensor harness connector.

2. Insert a jumper harness between the pins A and B of the OLS connector. Measureresistance between cavity Y2 and L2. See Figure 81-3.

[a] If reading is greater than 10 , cavity #452 is open. Repair the open or replace theharness; verify the repair. See Figure 81-3. Refer to section 81.4.6.

[b] If the reading is less than 10 , contact Detroit Diesel Technical Service, or trya test ECM.

81.4.6 Verify Repairs

Perform the following steps to verify repairs:

1. Plug in all connectors.

2. Start and run the engine for two minutes.

3. Check for codes.

[a] If no codes display, the repair is complete.

[b] If code 98/3 displays, troubleshooting is complete. Review the troubleshooting of theOLS to find the error. Refer to section 81.4.1.



81.5 TROUBLESHOOT EXHAUST GAS TEMPERATURE


The following procedures troubleshoot the Exhaust Gas Temperature. For exhaust temperatureand pressure sensor wiring schematic, see Figure 81-4.

Figure 81-4 Exhaust Temperature and Pressure Sensor Wiring Schematic





Typically, the exhaust gas temperature circuit failed high is caused by an open signal or short tobattery +. Perform the following steps to troubleshoot code p 173/3:

1. Disconnect the ETS connector.

2. Install a jumper wire between the two pins at the ETS.

3. Unplug both 30–pin connectors at the ECM.

4. Measure resistance between D3 of the VIH connector and W1 of the ESH connector;see Figure 81-4.

[a] If resistance measures < 5 , refer to section 81.5.2.

[b] If resistance is > 5 , either the circuit #416 is opened, or #749 is opened. Repairthe open or replace the wire and test.


Perform the following steps to check for a short:

1. Remove the jumper.

2. Measure resistance again between D3 and W1; see Figure 81-4.

[a] If the reading is > 400 , the resistor between circuit #416 and #749 has failed.Replace the resistor or replace the harness.

[b] If the reading is < 400 , replace the ETS, and refer to section 81.5.3.

81.5.3 Test

Perform the following steps to test the repair:

1. Connect all removed connectors.

2. Start and run the engine.

3. Perform road test.

4. Plug in DDR and read active codes.

[a] If no codes display, repairs are complete.

[b] If code 81 displays, review the procedure for checking exhaust gas temperaturecircuit failed high; refer to section 81.5.3. If this is the second time through theprocedure, call DDC Technical Service, or try a test ECM.



1-secm-03-81.pdf - ddcsn. · pdf fileddec iii/iv single ecm troubleshooting guide ... figure...

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