Honda ACCORD HYBRID 2005 Service Manual page 254

Fuel and Emissions Systems
S y m p t o m T r o u b l e s h o o t i n g I n d e x
W h e n the vehicle has one of these s y m p t o m s , check for a diagnostic trouble code (DTC) w i t h the HDS. If there is no
DTC, do the diagnostic procedure for the s y m p t o m , in the sequence listed, until y o u find the cause.
Symptom Diagnostic procedure Also check for
Engine will not start
(MIL w o r k s OK, no DTCs set,
IMA motor works OK)
1. Test the 12 V battery (see page 22-71).
2. Troubleshoot the starter circuit (see page 4-5).
3. Check the fuel pressure (see page 11-356).
• Low compression
• No ignition spark
• Intake air leaks
• Locked up engine
• Broken t i m i n g belt
• Contaminated fuel
Engine will not start
(MIL comes on and stays o n ,
or never comes on at all, no
DTCs set, starter or IMA
m o t o r works OK)
Troubleshoot the MIL circuit (see page 11-199).
Engine will not start
(immobilizer indicator stays
on or flashes)
Troubleshoot the immobilizer system (see page 22-277).
Engine starts but stalls
i m m e d i a t e l y
(MIL w o r k s OK, no DTCs set)
Troubleshoot the immobilizer system (see page 22-277).
Engine is hard to start
(MIL w o r k s OK, no DTCs set)
1. Test the 1 2 V battery (see page 22-71).
2. Check the fuel pressure (see page 11-356).
3. Clean the throttle body (see page 11-381).
• Low compression
• Intake air leaks
• Contaminated fuel
• Weak spark
Cold fast idle too low
(MIL w o r k s OK, no DTCs set)
1. Do the PCM idle learn procedure (see page 11-340).
2. Check the idle speed (see page 11-339).
3. Clean the throttle body (see page 11-381).
Cold fast idle too high
(MIL w o r k s OK, no DTCs set)
1. Do the PCM idle learn procedure (see page 11-340).
2. Check the idle speed (see page 11-339).
3. Do the throttle position learning check (see page
11-381).
Idle speed fluctuates
(MIL w o r k s OK, no DTCs set)
1. Do the PCM idle learn procedure (see page 11-340).
2. Check the idle speed (see page 11-339).
3. Do the carbon accumulation check (see page 11-381).
Intake v a c u u m leaks
After w a r m i n g up, idle speed
is below specification w i t h o u t
load
(MIL w o r k s OK, no DTCs set)
1. Troubleshoot the EPS signal circuit (see page 11-336).
2. Do the carbon accumulation check (see page 11-381).
After w a r m i n g up, idle speed
is above specification w i t h o u t
load
(MIL w o r k s OK, no DTCs set)
Troubleshoot the EPS signal circuit (see page 11-336).
Low power
(MIL works OK, no DTCs set)
Check the fuel pressure (see page 11-356). • Low compression
• Incorrect camshaft
t i m i n g
• Incorrect engine oil
level
Engine stalls
(MIL w o r k s OK, no DTCs set)
1. Do the PCM idle learn procedure (see page 11-340).
2. Check the fuel pressure (see page 11-356).
3. Check the idle speed (see page 11-339).
4. Troubleshoot the brake pedal position switch signal
circuit (see page 11-338).
• Intake air leaks
• Faulty harness and
sensor
connections
11-14