Dtc P0670: Glow Plug Module Control Circuit Malfunction - Suzuki GRAND VITARA 2005 Service Manual

DTC P0670: Glow Plug Module Control Circuit Malfunction

NOTE
• Cylinder number is counted from flywheel side.
• Conditions for applying fault finding procedures to stored faults:
The fault is declared present after several attempts to start the engine, or perform output test "Pre/
post Heater Relay Control" on SUZUKI scan tool.
• It is difficult or even impossible to start the engine when cold.
• If the fault is present, the Injection warning light (gravity 1 warning light) is lit.
• 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".
Troubleshooting
Check the glow plug control module connections.
Check the connections on all the glow plugs.
Repair if necessary.
Check the condition of the 80A fuse on the battery fuse box.
Check the resistance of the glow plugs:
Replace any plug whose resistance is not less than 2 Ω at 20 °C, 68 °F.
Check the following connections for continuity and make sure there is no interference resistance:
• Between cylinder 3 glow plug terminal and "C74-5" wire of the glow plug control module connector
• Between cylinder 1 glow plug terminal and "C74-8" wire of the glow plug control module connector
• Between cylinder 4 glow plug terminal and "C74-4" wire of the glow plug control module connector
• Between cylinder 2 glow plug terminal and "C74-6" wire of the glow plug control module connector
Check for the presence of +12 V on "C74-7" wire of the glow plug control module (by 80A fuse on battery fuse
box).
If the fault is still present.
Check the ECM connections.
Check continuity and make sure there is no interference resistance on the following connection:
• Between "C74-3" wire of glow plug control module connector and "C85-1" terminal of ECM connector
• Between "C74-1" wire of glow plug control module connector and "C85-17" terminal of ECM connector
If the fault is still present, replace the glow plug control module.
Engine General Information and Diagnosis: 1A-77
S5JB0B1104128