Suzuki SY413 Service Manual page 2810

DTC P1510 ECM BACK-UP POWER SUPPLY MALFUNCTION
WIRING DIAGRAM
1. Main fuse
2. Relay box
"LAMP"
CIRCUIT DESCRIPTION
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 AND TROUBLE AREA
DTC DETECTING CONDITION
Back-up circuit voltage is out of specification.
DTC CONFIRMATION PROCEDURE
1) Connect scan tool to DLC with ignition switch OFF.
2) Turn ON ignition switch and clear DTC using scan tool and run engine at idle speed for 1 min.
3) Check DTC and pending DTC.
TROUBLESHOOTING
STEP
1 Was ENGINE DIAG. FLOW TABLE performed?
2 Battery Voltage Supply Circuit Check
1) Remove ECM.
2) While engine running, check voltage between
E92-13 and ground.
Is voltage 10 – 14 V?
ENGINE GENERAL INFORMATION AND DIAGNOSIS (J18 ENGINE WITH WU TWC) 6-2-93
ACTION
TROUBLE AREA
Battery voltage supply circuit
YES
Go to Step 2.
Poor E92-13 connection or
intermittent trouble.
Check for intermittent refer-
ring to "Intermittent and Poor
Connection" in section 0A.
If wire and connections are
OK, substitute a known-good
ECM and recheck.
NO
Go to ENGINE
DIAG. FLOW
TABLE.
"W" circuit open or
short.