Honda Acura NSX 1991, Service Manual

Page: 196 / 1420

Troubleshooting
Self-diagnostic Procedures
3
MANIFOLD ABSOLUTE PRESSURE (MAP SENSOR)
I
1 l-40
I
5
4
CRANK ANGLE A
1 l-46
6 COOLANT TEMPERATURE
SENSOR) 11-48
7 THROTTLE ANGLE 11-50
No. 1 CYLINDER POSITION A SENSOR)
I
11-46
12
1 3
INTAKE AIR TEMPERATURE SENSOR)
EXHAUST GAS RECIRCULATION SYSTEM
ATMOSPHERIC PRESSURE (PA SENSOR1
11-52
11-128
1 1 - 5 4
1 4
ELECTRONIC AIR CONTROL
11-70
15
IGNITION OUTPUT SIGNAL 11-56
16
FUEL INJECTOR
1 l-89
17
VEHICLE SPEED SENSOR
11-58
IGNITION TIMING ADJUSTMENT
II-60
.
2 1 FRONT SPOOL SOLENOID VALVE
6-l 5
22
FRONT VALVE TIMING OIL PRESSURE SWITCH
6-17
2 3 FRONT KNOCK SENSOR
1 l-62
36
TCFC SIGNAL 19-102
41
FRONT OXYGEN SENSOR HEATER
11-32
If codes other than those listed above are indicated, verify the code. If the code indicated is not listed above, replace
the ECU.
The Check Engine light may come on, indicating a system problem, when, in fact, there is a poor or intermittent
connection. First, check the electrical connections, clean or repair connections if necessary.
The Check Engine light and D indicator light may come on simultaneously when the self-diagnosis indicator blinks 7
and 17. Check the PGM-FI system according to the PGM-FI control system troubleshooting, then recheck the D in-
dicator light. If it comes on, see page 14-52.
The Check Engine light and TCS indicator light may come on simultaneously when the self-diagnosis indicator blinks
3, 5, 6, 13, 15, 16, 17, 35 and 36. Check the PGM-FI system according to the PGM-FI control system
troubleshooting, recheck the TCS indicator light. If it comes on, see page 19-84.
l The Check Engine light does not come on when there is a malfunction in the A/T signal. However, when the two ter-
minals of the service check connector are connected with a jumper wire and, the Check Engine light will indicate the
codes.
I I - 2 0