Suzuki GA413, Service Manual

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ENGINE GENERAL INFORMATION AND DIAGNOSIS 6-91
GA413
supple
DTC P1510 ECM BACK-UP POWER SUPPLY MALFUNCTION
CIRCUIT DESCRIPTION
1. Main fuse
2. Fuse box
Battery voltage is supplied so that diagnostic trouble code memory, values for engine control learned by ECM, etc.
are kept in ECM even when the ignition switch is turned OFF.
DTC DETECTING CONDITION POSSIBLE CAUSE
Low voltage at terminal L20-12 after starting engine. “WHT” circuit open
ECM malfunction
DTC CONFIRMATION PROCEDURE
1) Clear DTC, start engine and run it at idle for 1 min.
2) Select “DTC” mode on scan tool and check DTC.
INSPECTION
STEP ACTION YES NO
1 Was “ENGINE DIAG. FLOW TABLE” performed? Go to Step 2. Go to “ENGINE DIAG.
FLOW TABLE”.
2 Check for voltage at terminal L20-12 of ECM
connector disconnected with ignition switch OFF.
Is it 10 – 14 V? Poor L20-12 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 and
recheck. “WHT” circuit open.