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PGM-FI System
DTC Troubleshooting (cont'd)
DTC P0560: ECM/PCM Back up Circuit Low
Voltage
NOTE: If the No. 13 CLOCK BACK UP (7.5A) fuse in the
passenger's under-dash fuse/relay box is removed and
the engine is started, the MIL will come on and the ECM
/PCM will store DTC P0560.
1. Reset the ECM/PCM (see page 11-4).
2. Start the engine.
Is DTC P0560
indicated?
Y E S - G o to step 3.
NO —Intermittent failure, system is OK at this time.
Check for poor connections or loose wires at the
No. 13 CLOCK BACK UP (7.5A) fuse in the
passenger's under-dash fuse/relay box and
ECM/PCM. •
3. Turn the ignition switch OFF.
4. Inspect the No. 13 CLOCK BACK UP (7.5A) fuse in
the passenger's under-dash fuse/relay box. •
Is the fuse
OK?
5. Measure voltage between ECM/PCM connector
terminal B21 and body ground.
E C M / P C M C O N N E C T O R B (25P)
1
2
3 4
5
/
8
9
10
11 12 13 14
/
16 17 18
19
2 0
21
2 2
23 24 25
V B U ( W H T / Y E L )
W i r e s i d e o f f e m a l e t e r m i n a l s
Is there battery
voltage?
Y E S - S u b s t i t u t e a known-good ECM/PCM and
recheck (see page 11-5). If the symptom/indication
goes away, replace the original ECM/PCM. •
NO —Repair open in the wire between the E C M /
PCM (B21) and the No. 13 CLOCK BACK UP (7.5A)
fuse in the passenger's under-dash fuse/relay
box.B
Y E S - G o to step 5.
NO —Check for these problems.
• Repair short in the wire between the ECM/PCM
(B21) and No. 13 CLOCK BACK UP (7.5A) fuse in
the passenger's under-dash fuse/relay box. •
• Repair short in the wire in the back up circuit
(see page 22-46). •
11-76
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Troubleshooting
