Circuit/System Testing

WARNING:

Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed.

The High Voltage Disabling procedure will perform the following tasks:

• Identify how to disable high voltage.
• Identify how to test for the presence of high voltage.
• Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed.

Failure to follow the procedures exactly as written may result in serious injury or death.

DTC P1F5A or P1F5B, without P1F59 Diagnosis

1. Vehicle OFF, disconnect the X3 harness connector at the K20 Engine Control Module, Vehicle On
2. Test for 4.6 V - 7.0 V between the signal circuit terminal 19 X3 and ground.
   • If less than 4.6 V 
   1. Vehicle OFF, disconnect the harness connector at the K1 14V Power Module.
   2. Test for infinite resistance between the signal circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
   3. Test for less than 2 Ω in the signal circuit end to end.
      • If greater the 2 Ω, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K1 14V Power Module.
   • If greater than 7.0 V 
   1. Vehicle OFF, disconnect the harness connector at the K1 14V Power Module, Vehicle in Service Mode.
   2. Test for less than 1 V between the signal circuit 19 X3 and ground.
      • If greater than 1 V, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K1 14V Power Module..
   • If between 4.6 V - 7.0 V 
3. Test or replace the K20 Engine Control Module.

DTC P1F59 Diagnosis

NOTE:

You must perform Circuit/System Verification first

1. Disable the high voltage system for servicing the T18 Battery Charger, K1 14V Power Module and the A4 Hybrid/EV Battery Pack. Refer to High Voltage Disabling
2. Disconnect the X3 connector at the T18 Battery Charger, the X4 connector at the K1 14V Power Module and the X6 connector at the A28 Hybrid/EV Battery Contactor Assembly
3. Verify that all HV harness connector and the mating module connector terminals are free from moisture, corrosion, and arc flash damage.
   • If any terminals show signs of damage 

     Replace the HV wiring harness and affected modules as necessary

   • If no arc flash damage, moisture, or corrosion is found 
4. Test the following HV harness terminals for less than 2 Ω end to end:
   • X6-1 to X4-B
   • X6-1 to X3-1
   • X6-2 to X4-A
   • X6-2 to X3-2
   • If greater than 2 Ω 

     Replace the HV wiring harness

   • If less than 2 Ω 

     Replace the K1 14V Power Module

5. Enable high voltage. Refer to High Voltage Enabling
6. Verify the DTC does not set
   • If the DTC sets 

     Replace the K20 Engine Control Module

   • If the DTC does not set 
7. All OK