Pinpoint Test X: The PRNDL Indicator is Never On/Always Displays P
Instrumentation, Message Center and Warning Chimes
Pinpoint Test X: The PRNDL Indicator is Never On/Always Displays P
Normal Operation
The Instrument Panel Cluster (IPC) receives the transmission range status and the select shift status from the PCM over the High Speed Controller Area Network (HS-CAN). The IPC (Instrument Panel Cluster) also uses a park detect switch (part of the brake shift interlock actuator) to signal the IPC (Instrument Panel Cluster) the shift lever is fully seated in the PARK (P) position. The IPC (Instrument Panel Cluster) compares the park detect switch input with the transmission range status sent from the PCM and looks for vehicle speed above 16 km/h (10 mph). The IPC (Instrument Panel Cluster) provides a reference voltage to the brake shift interlock. When the selector lever is in PARK (P), the brake shift indicator routes the reference voltage to ground pulling the circuit low to the IPC (Instrument Panel Cluster). When the selector lever is moved out of PARK (P), the brake shift interlock opens the ground, sending the reference voltage high.
When in select shift mode, the select shift indication is illuminated along with the PRNDM21 display. For example, when M is selected and select shift is selected, the PRNM21 illuminates the M and the select shift display illuminates 1-6 (base IPC (Instrument Panel Cluster) ) or M1-M6 (optional IPC (Instrument Panel Cluster) ) simultaneously.
If the transmission range information is missing from the PCM, the IPC (Instrument Panel Cluster) sets DTC U0100:00.
NOTE: If DTC U0100:00 sets in the IPC (Instrument Panel Cluster), other observable symptoms may be an inoperative speedometer, tachometer, temperature gauge or odometer. If DTC U0101:00 sets in the IPC (Instrument Panel Cluster), other observable symptoms may be the powertrain malfunction (wrench) warning indicator always on.
- DTC P1706:00 (High Vehicle Speed Observed In Park: No Sub Type Information)- a continuous memory DTC that sets if the IPC (Instrument Panel Cluster) receives a short to ground on the park detect switch input circuit, pulling the circuit low with a Vehicle Speed Sensor (VSS) input over 16 km/h (10 mph) for greater than 5 seconds (indicating the vehicle is in park and in motion).
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Brake shift interlock actuator
- PCM concern
- IPC (Instrument Panel Cluster)
PINPOINT TEST X : THE PRNDL INDICATOR IS NEVER ON/ALWAYS DISPLAYS P
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
X1 CHECK THE PRNDL DISPLAY PARK OPERATION
- Ignition ON.
- Shift the selector lever through the different gear positions while observing the PRNDL display.
- Place the selector lever in the PARK (P) position.
- Ignition OFF.
- Observe the PRNDL display immediately after turning the key off.
Does the PRNDL display the different ranges according to the selector lever position then display P for approximately 5 seconds when the key is turned off?
Yes
The system is functioning correctly at this time.
No
GO to X2.
X2 RETRIEVE AND RECORD THE IPC (Instrument Panel Cluster) DTCs FROM THE SELF-TEST
- Check for recorded IPC (Instrument Panel Cluster) DTCs from the self-test.
Are any DTCs recorded?
Yes
For DTC P1706:00, GO to X3.
For DTC U0100:00, GO to Pinpoint Test AT. Pinpoint Test AT: DTC U0100:00
For all other DTCs, REFER to DTC Charts. Instrumentation, Message Center and Warning Chimes
No
GO to X4.
X3 CONFIRM DTC P1706:00 IS STILL PRESENT
- CLEAR the DTCs. DRIVE the vehicle above 16 km/h (10 mph) for more than 5 seconds. REPEAT the self-test.
Is DTC P1706:00 present?
Yes
GO to X5.
No
The PRNDL is operating correctly at this time. The fault may be caused by an intermittent concern with the park detect input to the IPC (Instrument Panel Cluster).
X4 RETRIEVE AND RECORD THE DTCs FROM THE PCM KOEO (Key ON Engine OFF) SELF-TEST
- Check for recorded PCM DTCs from the Key ON Engine OFF (KOEO) self-test.
Are any PCM DTCs recorded?
Yes
REFER to Computers and Control Systems. TEST the system for normal operation.
No
INSTALL a new IPC (Instrument Panel Cluster). REFER to Instrument Panel Cluster (IPC) . TEST the system for normal operation.
X5 CHECK THE BRAKE SHIFT INTERLOCK OPERATION
- Apply the park brake and shift the transmission into NEUTRAL (N).
- Ignition OFF.
- Disconnect: Brake Shift Interlock C2008 (Column Shift).
- Disconnect: Brake Shift Interlock C3245 (Floor Shift).
- Clear the DTCs.
- Disengage the park brake and drive the vehicle above 16 km/h (10 mph) for more than 5 seconds.
- Retrieve the IPC (Instrument Panel Cluster) continuous memory DTCs.
Is DTC P1706:00 still present?
Yes
GO to X6.
No
INSTALL a new brake shift interlock actuator. TEST the system for normal operation.
X6 CHECK THE PARK DETECT INPUT CIRCUIT FOR AN OPEN OR SHORT TO GROUND
- Ignition OFF.
- Disconnect: IPC (Instrument Panel Cluster) C220.
- For column shift, measure the resistance between the IPC (Instrument Panel Cluster) C220-7, circuit CET52 (GN), harness side and the brake shift interlock C2008-2, circuit CET52 (GN), harness side; and between the IPC (Instrument Panel Cluster) C220-7, circuit CET52 (GN), harness side and ground.
- For floor shift, measure the resistance between the IPC (Instrument Panel Cluster) C220-7, circuit CET52 (GN), harness side and the selector lever C3245-3, circuit CET52 (GN), harness side; and between the IPC (Instrument Panel Cluster) C220-7, circuit CET52 (GN), harness side and ground.
Is the resistance less than 5 ohms between the IPC (Instrument Panel Cluster) and the brake shift interlock or selector lever, and greater than 10,000 ohms between the IPC (Instrument Panel Cluster) and ground?
Yes
GO to X7.
No
REPAIR circuit CET52 (GN) for an open or short to ground. REPEAT the self-test. CLEAR the DTCs.
X7 CHECK FOR CORRECT IPC (Instrument Panel Cluster) OPERATION
- Disconnect the IPC (Instrument Panel Cluster) connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the IPC (Instrument Panel Cluster) connector and make sure it seats correctly.
- Operate the system and verify the concern is still present.
Is the concern still present?
Yes
INSTALL a new IPC (Instrument Panel Cluster). REFER to Instrument Panel Cluster (IPC) . TEST the system for normal operation.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.