Dtc P0380: Glow Plug / Heater Circuit "A" Malfunction - Suzuki GRAND VITARA 2005 Service Manual

1A-52 Engine General Information and Diagnosis:

DTC P0380: Glow Plug / Heater Circuit "A" Malfunction

NOTE
• Conditions for applying fault finding procedures to stored faults:
The fault is declared present after output test "Pre/Post Heater Relay Control" on SUZUKI scan tool,
or after an attempted engine start.
• If the fault is present, it is difficult or even impossible to start the vehicle 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".
Detecting Condition
Displaying on SUZUKI scan tool
CC.1
CC.0
C0
1.DEF
Troubleshooting for CC.1: Short circuit to +12 V
Check the glow plug control module connections and the glow plug supply cables.
Check the ECM connections.
Repair if necessary.
Check the condition of the 80A fuse on the battery fuse box.
Check for continuity and insulation against the +12 V feed on the following connections:
• 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
Repair if necessary.
If the fault is still present, replace the glow plug control module.
Troubleshooting for CC.0: Open circuit or short circuit to vehicle body ground and CO: Open circuit
NOTE
• If the glow plug control module has a short circuit to vehicle body ground there is a risk that the
glow plugs will be operated continuously.
• The glow plugs and the engine may be damaged.
Check the glow plug control module connections and the glow plug supply cables.
Check the ECM connections.
Repair if necessary.
Check the condition of the 80A fuse on the battery fuse box.
Check the continuity and insulation against vehicle body ground of 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
Repair if necessary.
If the fault is still present, replace the glow plug control module.
Detecting condition
Short circuit to +12 V
Open circuit or short circuit to vehicle body ground
Open circuit
Internal electronic fault
S5JB0B1104111