Suzuki 2000 Grand Vitara SQ625 Service Manual page 101

DTC P1500 ENGINE STARTER SIGNAL CIRCUIT MALFUNCTION
WIRING DIAGRAM
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.
While engine cranking : 6 – 14 V
After starting engine
Is voltage as specified?
ACTION
: 0 – 1 V
ENGINE DIAGNOSIS (G16 / J20 ENGINES) 6-97
1. Starting motor
2. Transmission range sensor (switch)
3. Engine start switch in ignition (main) switch
TROUBLE AREA
D Engine start signal circuit
D 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.
NO
Go to "ENGINE
DIAG. FLOW
TABLE".
"B/Y" circuit open.