MBE 900/4000 PID 158 Troubleshooting

Troubleshooting PID 158

The following procedures will troubleshoot PID 158.‪

158 00 – Battery Voltage Switched — High

Perform the following steps to troubleshoot the high voltage fault code 158 00.‪

1. Start the engine and rev at rated speed.
2. Measure the voltage across the battery terminals. See Figure “Power Wiring” .
   

   Figure 1. Power Wiring

   1. If the voltage is greater than 14.5 V, troubleshoot the battery, starting, and charging system for an overvoltage condition. Refer to the OEM Vehicle Manual.
   2. If the voltage is between 14.5 and 11.0 V and fault code 158 00 is still active, contact the Detroit Diesel Technical Support Group.
3. Erase the fault code memory.

158 01 – Battery Voltage Switched — Low

Perform the following steps to troubleshoot the low voltage fault code 158 01. ‪

1. Turn the ignition on.
2. Measure the voltage across the battery terminals. See Figure “Power Wiring” .
   

   Figure 2. Power Wiring

3. If the voltage is less than 11.0 V, troubleshoot the battery, starting, and charging system for an undervoltage condition. Refer to the OEM Vehicle Manual.
4. Measure the voltage between pins 2 and 3 of the 21-pin connector. See Figure “Power Wiring” .
5. If the voltage is between 11.0 and 14.5 V, refer to “13.2.2.1 Required Action” .
6. Start and run the engine. Measure the voltage drop between pin 2 of the 21-pin connector and the positive battery terminal.
7. If the voltage was less than 11.0 V (ignition on and engine not running) and voltage drop between pin 2 of the 21-pin connector and the positive battery terminal is greater than 0.5 V (engine running), refer to “13.2.2.2 Required Action” .
8. With the engine still running, measure the voltage drop between pin 3 of the 21-pin connector and the negative battery terminal.
   1. If the voltage is less than 11.0 V and voltage drop between pin 3 of the 21-pin connector and the negative battery terminal is greater than 0.5 V, refer to “13.2.2.3 Required Action” .
   2. If the voltage is less than 11.0 V and voltage drop between pin 3 of the 21-pin connector and the negative battery terminal is less than 0.5 V, contact the Detroit Diesel Technical Support Group.

Section 13.2.2.1
Required Action

Perform the following steps to resolve fault code 158 01.‪

1. Replace the DDEC-VCU.
2. Erase the fault code memory.

Section 13.2.2.2
Required Action

Perform the following steps to resolve fault code 158 01.‪

1. Replace or repair the supply side wires and connectors between pin 2 of the 21-pin connector and battery.
2. Erase the fault code memory.

Section 13.2.2.3
Required Action

Perform the following steps to resolve fault code 158 01.‪

1. Replace or repair the ground side wires and connectors between pin 3 of the 21-pin connector and battery ground.
2. Erase the fault code memory.

158 02 – PLD-MR and DDEC-VCU Signals Unmatched

Perform the following steps to troubleshoot the fault code 158 02 for unmatched PLD-MR and DDEC-VCU signals. ‪

1. Check for active codes.
   1. If fault codes 158 02 and 168 03 are both still active, refer to “14.2.2 168 04 – Battery Voltage Low Fault” .
   2. If fault codes 158 02 and 158 01 are both still active, refer to “13.2.2 158 01 – Battery Voltage Switched — Low”
   3. If fault codes 158 02 and 158 00 are both still active, refer to “13.2.1 158 00 – Battery Voltage Switched — High” .
   4. If fault codes 158 02 and 168 04 are both still active, refer to “14.2.1 168 03 – Battery Voltage High Fault” .
2. Measure the difference in voltage inputs between the DDEC-VCU and PLD-MR. See Figure “Power Wiring” .
   

   Figure 3. Power Wiring

   1. If the voltage difference is less than 1.0 V, contact Detroit Diesel Technical Service Group.
   2. If the voltage difference is greater than 1.0 V with the DDEC-VCU indicating the low voltage, refer to “13.2.3.1 Required Actions” .
   3. If the voltage difference is greater than 1.0 V with the PLD-MR indicating the low voltage, refer to “13.2.3.2 Required Actions” .

Section 13.2.3.1
Required Actions

Perform the following steps to resolve fault code 158 02.‪

1. Replace or repair the bad contacts and/or voltage supply for pins 2 (ignition) and 3 (ground) of the 21-pin connector.
2. Erase the fault code memory.

Section 13.2.3.2
Required Actions

Perform the following steps to resolve fault code 158 02.‪

1. Replace or repair the bad contacts and/or voltage supply for pin 15 (power) and pins 9 and 11 (ground) on 16-pin connector.
2. Erase the fault code memory.