Troubleshooting - Honda Acura NSX 1991 Service Manual

Troubleshooting

Troubleshooting
NOTE: Across each row in the chart, the systems that could be sources of a symptom are ranked in the order they
should be inspected starting with 0. Find the symptom in the left column, read across to the most likely source, then
refer to the page listed at the top of that column. If inspection shows the system is OK, try the next most likely system
ECU
SYMPTOM
CHECK ENGINE
LIGHT TURNS ON
CHECK ENGINE
LIGHT BLINKS
ENGINE WON'T START
DIFFICULT TO START
ENGINE WHEN COLD
WHEN COLD
FAST IDLE
O U T O F S P E C
ROUGH IDLE
IRREGULAR
IDLING
WHEN WARM
RPM TOO
HIGH
WHEN WARM
RPM TOO
LOW
WHILE
WARMING UP
FREQUENT
STALLING
A F T E R
WARMING UP
MISFIRE OR
ROUGH
RUNNING
POOR FAILS
EMISSION
T E S T
ANCE
L O S S O F
P O W E R
these codes, substitute a known-good ECU and recheck. If the indication goes away, replace the original ECU.
: When the Check Engine light and the self-diagnosis indicator are on, the back-up system is in operation.
Substitute a known-good ECU and recheck. If the indication goes away, replace the original ECU.
I I - 1 6
Guide
MANIFOLD
OXYGEN
ABSOLUTE
SENSOR PRESSURE
SENSOR
26 30, 32, 36 40
I
SENSOR
46
50
I
52 54 56 6-15