Series 60 DDEC V Troubleshooting

Section 41.2 Troubleshooting Flash Code 37, PID 95/FMI 3

Section 41.2
Troubleshooting Flash Code 37, PID 95/FMI 3

This diagnostic condition is typically:‪

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

Section 41.2.1
Multiple Code Check

Perform the following steps to check for multiple codes.‪

  1. Turn ignition ON.
  2. Plug the diagnostic tool.
  3. Read active codes.
    1. If active code p 95/3 was logged, and no other codes were logged, refer to "41.2.2 Sensor Check" .
    2. If active codes p 94/3 and any or all of the following codes were logged, p 110/3 or 4, p 174/3 or 4, p 175/3 or 4, p 101/3 or 4, p 102/3 or 4, p 100/3 or 4,p 95/4, p 73/3 or 4, refer to "79 Engine Harness" .

Section 41.2.2
Sensor Check

Perform the following steps to check the sensor.‪

  1. Turn ignition switch OFF.
  2. Disconnect FRS/Fuel Restriction Sensor connector.
  3. Turn ignition ON.
  4. Start and run engine.
  5. Select Engine Temperature (COOLANT TEMP & OIL on the DDR).
  6. Warm up engine until engine temperature reading is greater than 60°C (140°F).
  7. Leave engine running at idle after warm-up. Run for five minutes.
  8. Read active codes.
    1. If active codes p 95/3 and any other codes were logged, refer to "41.2.4 Check for Short" .
    2. If active code 95/4 and any other codes except 95/3 was logged, refer to "41.2.3 Return Circuit Check" .

Section 41.2.3
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 pins A and B of the FRS/Fuel Restriction Sensor harness connector. See Figure "FRS/Fuel Restriction Sensor" .
    Click to see this graphic in a separate window

    Figure 1. FRS/Fuel Restriction Sensor

  4. Measure resistance between sockets E-16 and E-15 on the Engine Harness connectors.
    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, or open, the return line (E-15) is open. Repair the open and refer to "41.2.5.1 Verify Repairs" .
  5. Inspect terminals at the FRS/Fuel Restriction 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 "41.2.5.1 Verify Repairs" .
    2. If the terminals and connectors are not damaged, replace the FRS/Fuel Restriction Sensor and refer to "41.2.5.1 Verify Repairs" .

Section 41.2.4
Check for Short

Perform the following steps to check for a short.‪

  1. Turn ignition OFF.
  2. Disconnect the Engine Harness connectors at the ECM/ECU.
  3. Measure resistance between sockets E-12 and E-16 on the Engine Harness connector.
    1. If the resistance measurement is greater than 100 Ω or open, refer to "41.2.5 Check for Short to Battery +" .
    2. If the resistance measurement is less than or equal to 100 Ω, the signal line (E-16) is shorted to the engine +5 volt line (E-12). Repair the short and refer to "41.2.5.1 Verify Repairs" .

Section 41.2.5
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 Interface Harness connector. See Figure "ECM/ECU Engine/Vehicle Interface Harness Connector" .
  3. Measure resistance between socket E-16 on the Engine Harness connector and socket V-15 of the Vehicle Interface Harness connector, and between E-16 and sockets V-61 and V-65.
    1. If the resistance measurement is greater than 1,000 Ω or open, go to step 4 .
    2. If the resistance measurement is less than or equal to 1,000 Ω, a short exists between sockets where less than 1,000 Ω was measured. Repair short and reinsert fuses. Refer to "41.2.5.1 Verify Repairs" .
    3. Click to see this graphic in a separate window

      Figure 2. ECM/ECU Engine/Vehicle Interface Harness Connector

  4. Inspect terminals at the ECM/ECU connector (both the ECM/ECU and harness side) for damage: bent, corroded, and unseated pins or sockets.
    1. If terminals and connectors are damaged, repair them. Refer to "41.2.5.1 Verify Repairs" .
    2. If terminals and connectors are not damaged, replace the FRS/Fuel Restriction Sensor (see Figure "FRS/Fuel Restriction Sensor" ) and check the active codes. If code p 95/3 is logged, reprogram the ECM/ECU. Refer to "41.2.5.1 Verify Repairs" .
      Click to see this graphic in a separate window

      Figure 3. FRS/Fuel Restriction Sensor

Section 41.2.5.1
Verify Repairs

Perform the following steps to verify repairs.‪

  1. Turn ignition switch OFF and reconnect all connectors.
  2. Turn ignition ON and clear codes.
  3. Start and run the engine for one minute.
  4. Stop the engine and check diagnostic tool for codes.
    1. If no codes are logged, no further troubleshooting is required.
    2. If codes p 95/3 was not logged, and other codes are logged, refer to "18.3 First Step for Diagnosing a Fault Within the DDEC System" .
    3. If code p 95/3 and other codes are logged, review this section from the first step to find the error. Refer to "41.2.1 Multiple Code Check" .


Series 60 DDEC V Troubleshooting Guide - 6SE570
Generated on 10-13-2008

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