Dtc P0645: A/C Compressor Relay Control Circuit - Suzuki Grand Vitara 2011 Manual

1A-337 Engine General Information and Diagnosis: For Diesel Engine Model

DTC P0645: A/C Compressor Relay Control Circuit

NOTE
• For vehicle not equipped with A/C system, it is not abnormal even if the DTC is detected.
• Conditions for applying fault finding procedures to stored faults:
The fault is declared present after the engine is started.
• Use service wire for all operations on the ECM connectors.
Wiring Diagram
For wiring circuit and connector number, refer to "A-5 Engine and A/C Control System Circuit Diagram (DSL) in
Section 9A".
Detecting Condition
Displaying on SUZUKI scan tool
CO0
CC1
Troubleshooting for CO0: Open circuit or short circuit to vehicle body ground
Check the condition of the A/C compressor relay.
Check the ECM connections.
Repair if necessary.
Check the A/C compressor relay mounting connections.
If these checks are correct,
Check the continuity and insulation from vehicle body ground of the following connections:
• Between "E33-12" wire of A/C compressor relay mounting connector and "E66-13" terminal of ECM connector
• Between "E33-11" wire of A/C compressor relay mounting connector and "E33-6" wire of main relay connector
Repair if necessary.
If the fault is still present, substitute a known-good ECM and recheck.
Troubleshooting for CC1: Short circuit to +12 V
Check the condition of the A/C compressor relay.
Check the ECM connections.
Repair if necessary.
Check the A/C compressor relay mounting connections.
Check the continuity and insulation from +12 V of the following connection:
• Between "E33-12" wire of A/C compressor relay mounting connector and "E66-13" terminal of ECM connector
Repair if necessary.
If the fault is still present, substitute a known-good ECM and recheck.
Detecting condition
Open circuit or short circuit to vehicle body ground
Short circuit to +12 V
S6JB0A1124149