Pinpoint Test C: Pcm Diagnostic Trouble Code Repair Actions P023B Pulse Width Modulated Short To Ground

WARNING: This page is about a different variant/trim than selected.

C1: PCM DIAGNOSTIC TROUBLE CODE REPAIR ACTIONS P023B PULSE WIDTH MODULATED SHORT TO GROUND 1
1. Using the Jaguar Land Rover approved diagnostic equipment, check for DTC P023B set in the PCM
  Is the coolant pump running?
  
  Yes: Clear the DTC s disconnect the coolant pump connector and retest. GO to C2.
  
  No: Check potential difference across the coolant pump. GO to C5.
C2: PCM DIAGNOSTIC TROUBLE CODE REPAIR ACTIONS P023B PULSE WIDTH MODULATED SHORT TO GROUND 2
1. Check if DTC P023B resets
  Did DTC P023B reset?
  
  Yes: The fault is not the coolant pump. Disconnect the wiring harness and measure the resistance between the PCM PWM terminal and earth terminal of the connector, checking for PWM short to ground in the wiring between the PCM and the pump. GO to C3.
  
  No: If DTC P023A was set GO to C4.
C3: PCM DIAGNOSTIC TROUBLE CODE REPAIR ACTIONS P023B PULSE WIDTH MODULATED SHORT TO GROUND 3
1. Check the resistance between the PCM PWM terminal and the earth terminal of the coolant pump
  Was a short circuit or low continuity detected?
  
  Yes: Check the wiring harness for damage or short circuit. Check the connector for backed out pins and corroded connectors. Inspect the pump pins for corrosion. Repair as necessary
  
  No: Using the Jaguar Land Rover approved diagnostic equipment, update the PCM to the latest level software, clear the DTC s and retest. If the fault persists, raise a TA regarding a possible PCM fault
C4: PCM DIAGNOSTIC TROUBLE CODE REPAIR ACTIONS P023B PULSE WIDTH MODULATED SHORT TO GROUND 4
1. Using the Jaguar land rover approved diagnostic equipment, check if DTC P023A has set?
  Did DTC P023A set?
  
  Yes: Visually inspect the coolant pump connector pins for corrosion. If the pins are corroded, inspect the wiring harness for corrosion or damage and repair as necessary. Unrepaired wiring harness, allowing water ingress, will lead to a repeat failure. Install a new coolant pump and record the observations on claim/EPQR
  
  No: DTC P023A should not have set. Raise a TA
C5: PCM DIAGNOSTIC TROUBLE CODE REPAIR ACTIONS P023B PULSE WIDTH MODULATED SHORT TO GROUND 5
1. Measure the potential difference across the coolant pump. Disconnect the connector from the pump, connect the multimeter +ve terminal to the power terminal in the harness connector and multimeter -ve terminal to the earth terminal in the harness connector. measure voltage across the harness power and ground terminals
  Is the potential difference across the coolant pump between 8v and 17v?
  
  Yes: If the potential difference is between 8v and 17v GO to C6.
  
  No: If the potential difference is not between 8v and 17v, check the battery and fuse. Check the continuity of the power and earth lines including the earth stud. If the voltage is above 8v the earth wiring or stud may be faulty. If the voltage is below 8v the power wiring may be faulty, or the battery may have low voltage. Repair as necessary. If the fault persists, restart the diagnostics according to the latest DTC s set.
C6: PCM DIAGNOSTIC TROUBLE CODE REPAIR ACTIONS P023B PULSE WIDTH MODULATED SHORT TO GROUND 6
1. Reconnect the connector and check if the coolant pump is running
  Is the coolant pump now running?
  
  Yes: If the coolant pump is running, clear the DTC s and retest. If the fault persists, restart the diagnostics according to the latest DTC s set
  
  No: If the coolant pump is not running, install a new coolant pump, clear the DTC s and retest.