MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
MULTIPORT FUEL INJECTION (MFI) <3.0L>
The PCM is checks the open circuit of battery
DTC SET CONDITIONS
Ignition switch: ON
The backup memory is lost.
TROUBLESHOOTING HINTS (The most likely
Open or shorted battery backup line, or loose
Required Special Tools
STEP 1. Check if the battery terminal is disconnected.
Q: Is the battery terminal disconnected before reading the
and then in 10 seconds turn the ignition switch to the
NO : Go to Step 3.
STEP 2. Using scan tool MB991502, read the diagnostic
To prevent damage to scan tool MB991502, always turn the
Q: Is the DTC P1603 is output?
YES : Go to Step 3.
CONNECTOR : C-40