Dtc P1642: Additional Heater Relay No.2 And 3 Control Circuit - Suzuki Grand Vitara 2011 Manual

Troubleshooting for CO0: Open circuit or short circuit to vehicle body ground
Check the condition of the additional heater relay No.1.
Check the ECM connections.
Repair if necessary.
Check the additional heater relay No.1 mounting connections.
If these checks are correct,
Check the continuity and insulation from vehicle body ground of the following connections:
• Between "C93-5" wire of additional heater relay No.1 mounting connector and "C86-39" terminal of ECM
connector
• Between "C93-1" wire of additional heater relay No.1 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 additional heater relay No.1.
Check the ECM connections.
Repair if necessary.
Check the turbocharger electric water pump relay mounting connections.
Check the continuity and insulation from +12 V of the following connection:
• Between "C93-5" wire of additional heater relay No.1 mounting connector and "C86-39" terminal of ECM
connector
Repair if necessary.
If the fault is still present, substitute a known-good ECM and recheck.

DTC P1642: Additional Heater Relay No.2 and 3 Control Circuit

NOTE
• 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
Engine General Information and Diagnosis: For Diesel Engine Model 1A-346
Open circuit or short circuit to vehicle body ground
Short circuit to +12 V
Detecting condition
S6JB0A1124147