1A
DTC P1642: Additional Heater Relay Circuit 2
NOTE:
This DTC indicated only with SUZUKI scan tool.
Wiring Diagram
For wiring circuit and connector number, refer to “K9K Engine (Type 5)” in A-4 Engine Control System Circuit Diagram .
Detecting Condition
Status displayed on SUZUKI scan tool Detecting condition Indicator / Warning light operation
CO 0 Open circuit or short circuit to ground Does not light
CC 1 Short circuit to 12 V
Troubleshooting
Check the condition and connection of the additional heater relay No.2 and No.3 socket.
Repair if necessary.
Check the condition of the ECM “C48” connector.
Repair if necessary.
Check the insulation, continuity and absence of interference resistance of the connections:
• Between “C48-16” terminal of ECM connector and “E93-5” terminal of additional heater relay No.2 socket
• Between “C48-16” terminal of ECM connector and “E173-4” terminal of additional heater relay No.3 socket
With the ignition on, check for the 12 volts supply the following terminals:
• Between “E93-1” terminal of additional heater relay No.2 socket and vehicle body ground
• Between “E93-4” terminal of additional heater relay No.2 socket and vehicle body ground
• Between “E173-3” terminal of additional heater relay No.3 socket and vehicle body ground
• Between “E173-2” terminal of additional heater relay No.3 socket and vehicle body ground
Repair if necessary.
If the fault persists, replace the relay.
After Repair
Deal with any faults detected by SUZUKI scan tool.
Clear the DTC.
Carry out a road test followed by another check with the SUZUKI scan tool.