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Test Description

WARNING: This page is about a different car, the 2004 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.

The number(s) below refer to the step number(s) on the diagnostic table.

  1. 2:  If the instrument panel tachometer is working properly, the cause of the malfunction is most likely between the 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 
1 Did you perform the Diagnostic System Check? - Go to Step 2  Go to Diagnostic System Check - ABS 
2 
  1. Start the engine.
  2. Vary the engine RPM with the throttle while observing the IP tachometer.
Does the IP 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 PCM connector C1 from the PCM.
  3. Disconnect the EBCM connector from the EBCM.
  4. Install the J 39700  Universal Breakout Box with the. See Special Tools and Equipment .J 39700-25  Cable Adapter to the EBCM harness only. See Special Tools and Equipment .
  5. Use a 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 DMM to measure the resistance between the universal breakout box terminal 11 and a good ground.
Is the resistance within the specified range?		 OL 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 C1 for the following:
    • Inspect for damage.
    • Inspect for poor terminal contact.
    • Inspect for corrosion.
  2. Inspect the EBCM connector for the following:
    • Inspect for damage.
    • Inspect for poor terminal contact.
    • Inspect for corrosion.
  3. Ensure both the PCM connector C1 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?
  • Is 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 - ABS 
8 Replace the EBCM. Refer to Electronic Brake Control Module Replacement .
Is the repair complete?		 - Go to Step 14  -
9  Check the PCM. Refer to Powertrain Control Module (PCM) Replacement 3.8L in Engine Controls.
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 in 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 the terminals or replace the connectors that exhibit signs of the following:
  • That exhibit signs of poor terminal contact.
  • That exhibit signs of corrosion.
  • That exhibit signs of 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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