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Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. 2:  If the instrument panel tachometer is working properly, the cause of the malfunction is most likely between the powertrain control module (PCM) and the EBCM, or the EBCM itself.
  2. 9:  At this point, the PCM is likely causing the malfunction. Refer to the OBD system check.
DTC C0236

Step Action Value(s) Yes No
Schematic Reference: ABS Schematics 
Connector End View Reference: ABS Connector End Views  or Engine Controls Connector End Views in Engine Controls - 3.6L
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2 
  1. Start the engine.
  2. Vary the engine RPM with the throttle while observing the instrument panel (I/P) tachometer.
Does the I/P tachometer work properly as the engine RPM changes?		 - Go to Step 3  Go to Step 9 
3
  1. Turn the ignition switch to the OFF position.
  2. Disconnect the powertrain control module (PCM) connector C2 from the PCM.
  3. Disconnect the electronic brake control module (EBCM) connector from the EBCM.
  4. Install the J 39700  Universal Pinout Box with the . See Special Tools . J 39700-530 Cable Adapter to the EBCM harness only.
  5. Use a J 39200  DMM to measure the resistance between the PCM harness connector tach signal circuit, and the universal breakout box terminal 11.
Is the resistance within the specified range?		 0-5 Ω Go to Step 4  Go to Step 10 
4 Use a J 39200  DMM to measure the resistance between the universal breakout box terminal 11 and a good ground.
Is the resistance within the specified range?		 0L Go to Step 5  Go to Step 11 
5
  1. Turn the ignition switch to the ON position
  2. Use a DMM to measure the voltage between the universal breakout box terminal 11 and a good ground.
Is the voltage within the specified range?		 0-2 V Go to Step 6  Go to Step 12 
6
  1. Inspect the PCM connector C2 for the following:
    • Damage
    • Poor terminal contact
    • Corrosion
  2. Inspect the EBCM connector for the following:
    • Damage
    • Poor terminal contact
    • Corrosion
  3. Ensure both the PCM connector C2 and the EBCM connector are properly retained when connected.
Are the following signs present on either connector:
  • Is poor terminal contact present?
  • Is corrosion present?
  • Are damaged terminals present?
 - Go to Step 13  Go to Step 7 
7
  1. Reconnect all the connectors.
  2. Using the scan tool clear the DTC.
  3. Disconnect the scan tool from the DLC.
  4. Start the engine.
Did DTC C0236 reset?		 - Go to Step 8  Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
8 Replace the EBCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.
Is the repair complete?		 - Go to Step 14  -
9  Check the PCM. Refer to Diagnostic System Check - Vehicle in Vehicle DTC Information.
Is the repair complete?		 - Go to Step 14  -
10 Repair an open between PCM and EBCM tach signal circuit. Refer to Wiring Repairs in Wiring Systems.
Is the repair complete?		 - Go to Step 14  -
11 Repair a short to ground in tach signal circuit. Refer to Wiring Repairs Wiring Systems.
Is the repair complete?		 - Go to Step 14  -
12 Repair a short to voltage in TACH signal circuit. Refer to Wiring Repairs in Wiring Systems.
Is the repair complete?		 - Go to Step 14  -
13 Replace all terminals or replace connectors that exhibit signs of the following:
  • Poor terminal contact
  • Corrosion
  • Damaged terminals

Refer to Wiring Repairs in Wiring Systems.
Is the repair complete?		 - Go to Step 14  -
14
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC, as specified in the supporting text.
Dose the DTC reset?		 - Go to Step 2  System OK
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