Pinpoint Test T: The O/D OFF Indicator Is Never/Always On
Instrumentation, Message Center and Warning Chimes
Pinpoint Tests
Pinpoint Test T: The O/D OFF Indicator Is Never/Always On
Normal Operation
The Overdrive (O/D) off function is controlled by the O/D off switch located on the shifter assembly. The O/D off status is transmitted to the Instrument Cluster (IC) from the PCM (4.0L engine), or the Transmission Control Module (TCM) (4.6L engine) over the High Speed Controller Area Network (HS-CAN).
This pinpoint test is intended to diagnose the following:
- TCM (4.6L engine)
- PCM (4.0L engine)
- IC
PINPOINT TEST T: THE O/D OFF INDICATOR IS NEVER/ALWAYS ON
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T1 RETRIEVE THE RECORDED DTCs FROM THE PCM AND TCM KOEO SELF-TEST
- Retrieve the recorded PCM (4.0L engine) or TCM (4.6L engine) DTCs from the Key ON Engine OFF (KOEO) self-test.
- Are any DTCs recorded?
Yes
If equipped with a 4.0L engine, REFER to Computers and Control Systems Information.
If equipped with a 4.6L engine, REFER to Automatic Transmission/Transaxle &/or Transmission Control Systems.
No
GO to T2.
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T2 CARRY OUT THE IC INDICATOR LAMP ACTIVE COMMAND USING THE SCAN TOOL
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: IC DataLogger.
- Select the IC O/D off indicator (OVERDRV) active command. Command the O/D OFF indicator on and off. Observe the O/D OFF indicator.
- Does the O/D OFF indicator illuminate when commanded on, and turn off when commanded off?
Yes
If equipped with a 4.0L engine, INSTALL a new PCM. REFER to Computers and Control Systems. TEST the system for normal operation.
If equipped with a 4.6L engine, INSTALL a new TCM (mechatronic assembly). REFER to Automatic Transmission/Transaxle &/or Transmission Control Systems.
TEST the system for normal operation.
No
INSTALL a new IC. REFER to Instrument Cluster (IC) Instrument Cluster (IC). TEST the system for normal operation.
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