Pinpoint Test H : DTCS P085D, P0860, P0861, P0862: Notes
WARNING: This page is about a different variant/trim than selected.
Refer to TRANSMISSION CONTROLS - 6F50/6F55 for schematic and connector information.
Normal Operation and Fault Conditions
The TRCM, GSM and the PCM communicate on the HS-CAN but use a redundant PWM hard wired system as a backup. If the HS-CAN system fails the TRCM, GSM and PCM communicate via this hard wired system. The GSM sends a PWM signal to the PCM when the CAN system is down so the PCM knows what range the operator has selected. The PWM operates at 2 frequencies, 190 Hz and 230 Hz and outputs 8 duty cycles.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| P085D | Gear Shift Control Module "A" Performance | The PCM detects a frequency signal less than 170 Hz or greater than 250 Hz. |
| P0860 | Gear Shift Control Module "A" Communication Circuit | The TRCM or the PCM detects a PWM signal out of range. |
| P0861 | Gear Shift Control Module "A" Communication Circuit Low | The TRCM or the PCM detects a duty cycle less than 10%. |
| P0862 | Gear Shift Control Module "A" Communication Circuit High | The TRCM or the PCM detects a duty cycle greater than 90%. |
Possible Sources
- Connectors damaged or pushed-out terminals, circuitry open, shorted to power or shorted to ground
- BCM fuse 15 (7.5A)
- GSM