17. Measure the voltage between SH-AWD control unit connector terminals B2 and B7.
Is there voltage?
YES -
Repair a short to power in the wire between the SH-AWD control unit connector terminal B7 and the right solenoid 4P connector.?
NO -
Go to step 18.
18. Measure the voltage between SH-AWD control unit connector terminals B2 and B6.
Is there voltage?
YES -
Repair a short to power in the wire between SH-AWD control unit connector terminal B6 and the right solenoid 4P connector.?
NO -
Update the SH-AWD control unit if it does not have the latest software See: Powertrain Management/Transmission Control Systems/Relays and
Modules - Transmission and Drivetrain/Relays and Modules - Differential/Control Unit/Testing and Inspection/SH-AWD Control Unit Update, or
substitute a known-good SH-AWD control unit See: Powertrain Management/Transmission Control Systems/Relays and Modules - Transmission
and Drivetrain/Relays and Modules - Differential/Control Unit/Service and Repair, and recheck. If the symptom/indication goes away with the
updated SH-AWD control unit, troubleshooting is complete. If the symptom/indication goes away with a known-good SH-AWD control unit,
replace the original SH-AWD control unit See: Powertrain Management/Transmission Control Systems/Relays and Modules - Transmission and
Drivetrain/Relays and Modules - Differential/Control Unit/Service and Repair.?
56-21
SRS DTC Troubleshooting: 56-21, 56-31, 56-22, 56-53, 56-32, 56-33
DTC 56-21, 56-31:
Lost Communication With the PCM (PGM-FI system)
DTC 56-22, 56-23, 56-32, 56-33:
Undefined Data Received From the PCM (PGM-FI system)
NOTE:
- Before doing this troubleshooting procedure, review SRS Precautions and Procedures See: Body and Frame/Air Bag(s) Arming and
Disarming/Service and Repair, General Troubleshooting Information See: Restraints and Safety Systems/Air Bag Systems/Testing and
