Dtc P1500 Engine Starter Signal Circuit Malfunction - Suzuki GRAND VITARA XL-7 Owner's Manual

6-1-114 ENGINE GENERAL INFORMATION AND DIAGNOSIS (H27 ENGINE)

DTC P1500 Engine Starter Signal Circuit Malfunction

WIRING DIAGRAM
1. Engine start switch in ignition (main) switch
DTC DETECTING CONDITION AND TROUBLE AREA
• Engine starts even though vehicle is at stop and engine start signal is
not inputted.
or
• Engine start signal is inputted continuously for specified time while
engine is running.
(2 driving cycle detection logic)
DTC CONFIRMATION PROCEDURE
NOTE:
Check to make sure that following condition is satisfied when using this "DTC CONFIRMATION PRO-
CEDURE".
• Intake air temp. : – 8°C (18°F) or higher
• Engine coolant temp. : – 8 – 110°C (18 – 230°F)
• Altitude (barometric pressure) : 2400 m, 8000 ft or less (560 mmHg (75 kPa) or more)
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 pending DTC by using scan tool.
TROUBLESHOOTING
Step
1 Was "ENGINE DIAG. FLOW TABLE" per-
formed?
2 Check for voltage at terminal C51-1-24 of
ECM (PCM) connector connected, under fol-
lowing condition.
Engine starter signal specification :
While engine cranking : 6 – 14 V
After starting engine : 0 – 1 V
Is voltage as specified?
2. Starting motor
DTC DETECTING CONDITION
Action
3. Transmission range sensor (switch)
Yes
Go to Step 2.
Poor C51-1-24 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.
4. ECM (PCM)
TROUBLE AREA
• Engine start signal circuit
• ECM (PCM)
No
Go to "ENGINE DIAG. FLOW TABLE"
in this section.
"BLK/YEL" circuit open.