Series 60 DDEC V Troubleshooting – Section 39.2 Troubleshooting Flash Code 35, PID 100/FMI 3

Section 39.2
Troubleshooting Flash Code 35, PID 100/FMI 3

This diagnostic condition is typically:‪

• Open sensor return circuit
• Sensor signal circuit is shorted to the sensor +5 volt supply
• Failed/damaged sensor

Section 39.2.1
Multiple Code Check

Perform the following steps to check for multiple codes.‪

1. Turn vehicle ignition switch ON.
2. Plug the diagnostic tool.
3. Read active codes.
   1. If code p 100/3 and no other codes were logged, refer to "39.2.2 Sensor Check" .
   2. If code p 100/3 and any of the following codes were logged: p 73/3 or 4, p 94/3 or 4, p 100/4, p 101/3 or 4, p 102/3 or 4, p 110/3 or 4, p 174/3 or 4, p 175/3 or 4, refer to "79 Engine Harness" .

Section 39.2.2
Sensor Check

Perform the following steps to check the sensor.‪

1. Turn ignition switch OFF.
2. Disconnect OPS/EOP Sensor connector.
3. Turn ignition ON.
4. Start and run the engine.
5. Select engine temperature (COOLANT TEMP or OIL TEMP) on the diagnostic tool.
6. Warm up engine until engine temperature reading is greater than 60°C (140°F).
7. After warm-up, let engine run at idle.
8. Read active codes.
   1. If active code p 100/3 and any other codes were logged, refer to "39.2.4 Check for Signal Short to 5 Volt" .
   2. If code p 100/4 and any other codes except p 100/3 were logged, refer to "39.2.3 Return Circuit Check" .

Section 39.2.3
Return Circuit Check

Perform the following steps to check the return circuit.‪

1. Turn vehicle ignition OFF.
2. Disconnect the engine harness connector at the ECM/ECU.
3. Install a jumper wire between pin 1 and pin 2 of the OPS/EOP Sensor harness connector. See Figure "Engine Harness Connector to Engine Oil Pressure Sensor" .
4. Measure resistance between sockets E-15 and E-31 on the engine harness connector.
   1. If resistance measurement is less than or equal to 5 Ω, go to step 5 .
   2. If resistance measurement is greater than 5 Ω, the return line (E-15) is open. Repair the open and refer to "39.2.5.1 Verify Repairs" .
   

   Figure 1. Engine Harness Connector to Engine Oil Pressure Sensor

5. Check terminals at the OPS/EOP Sensor connectors (both the sensor and harness side) for damage: bent, corroded and unseated pins or sockets.
   1. If the terminals and connectors are damaged, repair them and refer to "39.2.5.1 Verify Repairs" .
   2. If the terminals and connectors are not damaged, replace the OPS/EOP Sensor. Refer to "39.2.5.1 Verify Repairs" .

Section 39.2.4
Check for Signal Short to 5 Volt

Perform the following steps to check for signal open.‪

1. Turn vehicle ignition OFF.
2. Disconnect the engine harness connector at the ECM/ECU.
3. Measure resistance between sockets E-31 and E-12 on the engine harness connector. See Figure "ECM/ECU Engine Harness and VIH Connector" .
   1. If the resistance measurement is less than or equal to 100 Ω, the signal line (E-31) is shorted to the engine +5 volt line (E-12). Repair the short and refer to "39.2.5.1 Verify Repairs" .
   2. If the resistance measurement is greater than 100 Ω, or open, refer to "39.2.5 Check for Short to Battery (+)" .
   

   Figure 2. ECM/ECU Engine Harness and VIH Connector

Section 39.2.5
Check for Short to Battery (+)

Perform the following steps to check for a short to battery (+).‪

1. Remove both fuses to the ECM/ECU.
2. Disconnect the vehicle harness connector at the ECM/ECU. See Figure "ECM/ECU Engine Harness and VIH Connector" .
3. Measure resistance between socket E-31 on the engine harness connector and socket V-15 of the vehicle harness connector, and between E-31 and V-61 and V-65.
   1. If resistance measurement is greater than 100 Ω, or open, go to step 4 .
   2. If resistance measurement is less than or equal to 100 Ω, a short exists between sockets where less than 100 Ω resistance was read. Repair short and reinsert fuses. Refer to "39.2.5.1 Verify Repairs" .
4. Inspect the terminals at the ECM/ECU connector (ECM/ECU and harness side) for damage: bent, corroded, and unseated pins or sockets.
   1. If the terminals and connector are damaged, repair both and refer to "39.2.5.1 Verify Repairs" .
   2. If the terminals and connector are not damaged, go to step 5 .
5. Check terminals at the OPS/EOP Sensor connectors (both the sensor and harness side) for damage: bent, corroded and unseated pins or sockets.
   1. If the terminals and connectors are damaged, repair them and refer to "39.2.5.1 Verify Repairs" .
   2. If the terminals and connectors are not damaged, replace the OPS/EOP Sensor. Refer to "39.2.5.1 Verify Repairs" .

Section 39.2.5.1
Verify Repairs

Perform the following steps to verify repairs:‪

1. Turn ignition switch OFF.
2. Reconnect all connectors.
3. Turn ignition ON.
4. Clear codes.
5. Start and run the engine for one minute.
6. Stop engine.
7. Check codes with diagnostic tool.
   1. If no codes are logged, no further troubleshooting is required.
   2. If code p 100/3 is not logged, but other codes are logged, refer to "18.3 First Step for Diagnosing a Fault Within the DDEC System" .
   3. If code p 100/3 is logged and all system diagnostics are complete, contact Detroit Diesel Customer Support Center (313–592–5800).