DDEC TROUBLESHOOTING
87.3 TROUBLESHOOTING FLASH CODE 87
The following procedure will troubleshoot Flash Code 87.
87.3.1
Multiple Code Check
Perform the following steps to check for codes.
1. Turn vehicle ignition ON.
2. Plug in DDR. Read the codes.
[a] If codes p 73/4, 100/3 or 4, 102/3 or 4, 110/3 or 4, 174/3 or 4 or 175/3 or 4 are
logged, refer to section 91.1.
[b] If code 073/4 is logged and no other codes are logged, refer to section 87.3.2.
[c] If code 073/4 is logged, and none of the following codes are logged: 100/3 or 4,
102/3 or 4, 110/3 or 4, 174/3 or 4 or 175/3 or 4, refer to section 87.3.2.
87.3.2
Sensor Check
Perform the following steps to check the sensor.
1. Turn ignition OFF.
2. Disconnect the pump pressure sensor connector and install a jumper between sockets B
and C of the pump pressure sensor transducer connector.
3. Turn ignition ON.
4. Start engine and operate the Pressure Governor System (PGS) in the PRESSURE mode.
5. Read active codes.
[a] If code p 73/3 and any other code except p 73/4 display, check to ensure the ECM and
PGS sensor connectors are wired properly. If wired properly, refer to section 87.3.3.
[b] If code p 73/4 and any other codes display, refer to section 87.3.4.
87.3.3
Check Pressure Governor System Sensor Connectors
Perform the following steps to check the pressure governor system (PGS) sensor connectors.
1. Turn ignition OFF.
2. Inspect terminals at the pump pressure sensor connectors (sensor and harness side) for
damaged, bent, corroded, and unseated pins or sockets.
[a] If the terminals and connectors are not damaged, replace the PGS sensor.
Refer to section 87.3.7.
[b] If the terminals and connectors are damaged, repair them. Refer to section 87.3.7.
All information subject to change without notice.
6SE497 9709 Copyright © 1997 DETROIT DIESEL CORPORATION
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