Series 60 DDEC V Troubleshooting – Section 38.2 Troubleshooting Flash Code 34, PID 102/FMI 4

Section 38.2
Troubleshooting Flash Code 34, PID 102/FMI 4

This diagnostic condition is typically:‪

• Open sensor signal circuit
• Open sensor +5 volt supply circuit
• Sensor signal is shorted to sensor return circuit or to ground
• Sensor +5 volt supply is shorted to the sensor return circuit or ground
• Plugged or restricted air filter.

Section 38.2.1
Multiple Code Check

Perform the following steps to check for multiple codes.‪

1. Plug the diagnostic tool.
2. Turn vehicle ignition switch ON.
3. Read active codes.
   1. If code p 102/4 was logged and there are no other logged codes, refer to "38.2.2 Sensor Check" .
   2. If code p 102/4 and any of the following codes p 73/3 or 4, p 94/3 or 4, p 100/3 or 4, p 101/3 or 4, p 110/3 or 4, p 174/3 or 4, p 175/3 or 4, were logged, refer to "79 Engine Harness" .
   3. If code p 102/4 was logged and none of the following codes p 73/3 or 4, p 94/3 or 4, p 100/3 or 4, p 101/3 or 4, p 110/3 or 4, p 174/3 or 4, p 175/3 or 4, were logged, refer to "38.2.2 Sensor Check" .

Section 38.2.2
Sensor Check

Perform the following steps to check the sensor.‪

1. Turn vehicle ignition OFF.
2. Disconnect TBS/IMP Sensor connector.
3. Install a jumper wire between sockets 2 and 3 of the TBS/IMP Sensor harness connector. See Figure "Turbo Boost/Intake Manifold Pressure Sensor" .
4. Turn ignition ON.
5. Start engine and run until either the Amber Warning Lamp is on, or until the engine has been running at least one minute at greater than 1000 rpm.
6. Read logged codes.
   1. If active code p 102/4 and any other codes are logged, refer to "38.2.3 Check for +5 Volt" .
   2. If active code p 102/3 and any other codes except p 102/4 are logged, go to step 7 .
   

   Figure 1. Turbo Boost/Intake Manifold Pressure Sensor

7. Check terminals at the TBS/IMP Sensor connectors (both the TBS/IMP Sensor and harness side) for damage: bent, corroded and unseated pins or sockets.
   1. If the terminals and connectors are damaged, repair them. Refer to "38.2.8.1 Verify Repairs" .
   2. If the terminals and connectors are not damaged, replace the TBS/IMP Sensor. Refer to "38.2.8.1 Verify Repairs" .

Section 38.2.3
Check for +5 Volt

Perform the following steps to check for +5 volt.‪

1. Remove jumper.
2. Turn ignition ON.
3. Measure voltage on TBS/IMP Sensor harness connector, pin 1 (red lead) to pin 3 (black lead).
   1. If the voltage measurement is greater than 6 volts, refer to "38.2.8 Check for Short to Battery +" .
   2. If the voltage measurement is between 4 and 6 volts, refer to "38.2.4 Check for Signal Open" .
   3. If the voltage measurement is less than 4 volts, refer to "38.2.6 Check for Open +5 Volt Line" .

Section 38.2.4
Check for Signal Open

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. Install a jumper wire between pins 1 and 2 of the TBS/IMP Sensor harness connector. See Figure "Turbo Boost/Intake Manifold Pressure Sensor" .
4. Measure resistance between sockets E-39 and E-15 on the Engine Harness connector.
   1. If the resistance measurement is less than or equal to 5 Ω, refer to "38.2.5 Check for Short" .
   2. If the resistance measurement is greater than 5 Ω, or open, and the signal line (E-39) is open, repair the open. Refer to "38.2.8.1 Verify Repairs" .
   

   Figure 2. Turbo Boost/Intake Manifold Pressure Sensor

Section 38.2.5
Check for Short

Perform the following steps to check for short.‪

1. Remove jumper.
2. Measure resistance between pins 1 and 2 on the TBS/IMP Sensor harness connector.
   1. If measured resistance between pins 1 and 2 is greater than 100 Ω, or open, go to step 3 .
   2. If measured resistance between pins 1 and 2 is less than 100 Ω, the signal line (E-39) is shorted to the return line (E-15). Repair the short. Refer to "38.2.8.1 Verify Repairs" .
3. Also measure resistance between socket 2 and a good ground.
   1. If measured resistance between socket 2 and a good ground is greater than 100 Ω, or open, go to step 4 .
   2. If measured resistance between socket 2 and a good ground is less than 100 Ω, the signal line (E-39) is shorted to the battery ground. Repair the short and refer to "38.2.8.1 Verify Repairs" .
4. Check terminals at the ECM/ECU harness connector (both ECM/ECU and harness side) for damage: bent, corroded, and unseated pins or sockets. See Figure "Turbo Boost/Intake Manifold Pressure Sensor" .
   1. If terminals and connectors are damaged, repair them and refer to "38.2.8.1 Verify Repairs" .
   2. If terminals and connectors are not damaged, install a test ECM/ECU. Refer to "38.2.8.1 Verify Repairs" .
   

   Figure 3. Turbo Boost/Intake Manifold Pressure Sensor

Section 38.2.6
Check for Open +5 Volt Line

Perform the following steps to check for open +5 volt line.‪

1. Turn vehicle ignition OFF.
2. Disconnect the Engine Harness connectors at the ECM/ECU.
3. Install a jumper wire between pins 1 and 3 of the TBS/IMP Sensor harness connector. See Figure "ECM/ECU Engine and Vehicle Connector" .
4. Read resistance between sockets E-15 and E-12 on the Engine Harness connector.
   1. If the resistance measurement is less than or equal to 5 Ω, refer to "38.2.7 Check for Short" .
   2. If the resistance measurement is greater than 5 Ω, or open, the ECM/ECU +5 volt line (E-12) is open. Repair open. Refer to "38.2.8.1 Verify Repairs" .
   

   Figure 4. ECM/ECU Engine and Vehicle Connector

Section 38.2.7
Check for Short

Perform the following steps to check for short.‪

1. Remove jumper.
2. Measure resistance between pins 1 and 3 on the TBS/IMP Sensor harness connector. See Figure "Turbo Boost/Intake Manifold Pressure Sensor" .
   1. If measured resistance between pins 1 and 3 is greater than 100 Ω, or open, go to step 3 .
   2. If measured resistance between pins 1 and 3 is less than 100 Ω, the 5 volt supply (E-12) is shorted to the return line (E-15). Repair the short. Refer to "38.2.8.1 Verify Repairs" .
3. Also measure resistance between socket 3 and a good ground.
   1. If measured resistance between socket 3 and a good ground is greater than 100 Ω, or open, go to step 4 .
   2. If measured resistance between socket 3 and a good ground is less than 100 Ω, the 5 volt supply (E-12) is shorted to the battery ground. Repair the short and refer to "38.2.8.1 Verify Repairs" .
4. Check terminals at the ECM/ECU harness connector (both ECM/ECU and harness side) for damage: bent, corroded, and unseated pins or sockets. See Figure "Turbo Boost/Intake Manifold Pressure Sensor" .
   1. If terminals and connectors are damaged, repair them and refer to "38.2.8.1 Verify Repairs" .
   2. If terminals and connectors are not damaged, install a test ECM/ECU. Refer to "38.2.8.1 Verify Repairs" .

Section 38.2.8
Check for Short to Battery +

Perform the following steps to check for short to battery +.‪

1. Turn vehicle ignition OFF.
2. Remove both fuses to the ECM/ECU.
3. Disconnect the Engine Harness and Vehicle Interface Harness at the ECM/ECU.
4. Measure resistance between socket E-12 on the Engine Harness connector and socket V-15 of the Vehicle Interface Harness connector, and between E-12 and V-61 and V-65. See Figure "ECM/ECU Engine and Vehicle Connector" .
   1. If measured resistance is less than or equal to 100 Ω, a short exists between sockets where less than 100 Ω was measured. Repair short and reinsert fuses. Refer to "38.2.8.1 Verify Repairs" .
   2. If the resistance measurement is greater than 100 Ω, or open, go to step 5 .
5. Check terminals at the ECM/ECU harness connector (both ECM/ECU and harness side) for damage: bent, corroded, and unseated pins or sockets. See Figure "Turbo Boost/Intake Manifold Pressure Sensor" .
   1. If terminals and connectors are damaged, repair them and refer to "38.2.8.1 Verify Repairs" .
   2. If terminals and connectors are not damaged, install a test ECM/ECU. Refer to "38.2.8.1 Verify Repairs" .

Section 38.2.8.1
Verify Repairs

‪

Perform the following steps to verify repairs.‪

1. Turn vehicle ignition 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 diagnostic tool for codes.
   1. If no codes are logged, no further troubleshooting is required.
   2. If code p 102/4 and any other codes are logged, all system diagnostics are complete. Please review this section from the first step to find the error. Refer to "38.2.1 Multiple Code Check" .
   3. If code p 102/4 is not logged and any other codes are logged, refer to "18.3 First Step for Diagnosing a Fault Within the DDEC System" .