Dtc P1500 Engine Starter Signal Circuit Malfunction - Suzuki Engine 2002 GRAND VITARA SQ420 Service Manual

6-116 ENGINE GENERAL INFORMATION AND DIAGNOSIS (G16/J20 ENGINES)

DTC P1500 Engine Starter Signal Circuit Malfunction

WIRING DIAGRAM
[A] : M/T vehicle 1. To starting motor
[B] : A/T vehicle 2. Transmission range sensor (switch)
DTC DETECTING CONDITION AND TROUBLE AREA
DTC DETECTING CONDITION
Engine starts even though vehicle is at stop and engine start signal is not
inputted.
Engine start signal is inputted for specified time while engine is running.
(2 driving cycles detection logic)
DTC CONFIRMATION PROCEDURE
1) Connect scan tool to DLC with ignition switch OFF.
2) Turn ON ignition switch and clear DTC by using scan tool, then start engine and run it for 3 min. or more.
3) Check DTC and pending DTC by using scan tool.
TROUBLESHOOTING (DTC P1500)
Step
1 Was "Engine Diag. Flow Table" performed?
2 Check for voltage at terminal C51-3-18 of ECM
(PCM) connector connected, under following
condition.
Engine starter signal specification
While engine cranking : 6 – 14 V
After starting engine : 0 – 1 V
Is voltage as specified?
Action
3. Engine start switch in ignition (main) switch
4. ECM (PCM)
• Engine start signal circuit
• ECM (PCM)
Yes
Go to Step 2.
Poor C51-3-18 connection
or intermittent trouble.
Check for intermittent
referring to "Intermittent
and Poor Connection" in
Section 0A.
If wire and connections
are OK, substitute a
known-good ECM (PCM)
and recheck.
TROUBLE AREA
No
Go to "Engine Diag. Flow
Table".
"BLK/YEL" circuit open.