Suzuki Swift User Manual page 253

DTC P1510 ECM (PCM) BACK-UP POWER SUPPLY MALFUNCTION
CIRCUIT DESCRIPTION
Main
fuse
"LAMP"
Battery voltage is supplied so that diagnostic trouble code memory, values for engine control learned by ECM
(PCM), etc. are kept in ECM (PCM) even when the ignition switch is turned OFF.
DTC DETECTING CONDITION
D Low voltage at terminal C02-7 after starting engine.
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
1 Check for voltage at terminal C02-7 of ECM
(PCM)connector connected, under each
condition, ignition switch OFF and engine
running.
Is it 10 – 14 V at each condition?
ENGINE GENERAL INFORMATION AND DIAGNOSIS (SFI FOR G13) 6-1-97
Fuse box
DOME
RADIO
ACTION
POSSIBLE CAUSE
D "W" circuit open
D ECM (PCM) malfunction
YES
Poor C02-7 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
"W" circuit open.