1996 ACURA RL KA9 ignition

PGM-FI System

Description

Misfire detection is accomplished by monitoring the voltage of the spark plug with the spark plug voltage sensor which is

built into the ignition coil.

If misfiring strong enough to damage the catalyst is detected, the MIL will blink during the time of its occurrence, and a

misfire DTC will be stored. Then, after the misfire has ceased, the MIL will come on and stay on whenever the ignition

switch is ON (II).

If misfiring that increases emissions is detected during two consecutive driving cycles, the MIL will come on, and a misfire

DTC will be stored.

NOTE: If some of the DTCs listed below are stored at the same time as a misfire DTC, troubleshoot those DTCs first, then

troubleshoot the misfire DTC.

P1128, P1129: MAP sensor

P0171, P0172, P0174, P0175: Fuel supply system

P0401, P0404, P0406: EGR system

P1316, P1317, P1318, P1319: Spark Plug Voltage Detection System

P0345, P0349, P1336, P1337: CKP sensor

P0390, P0394, P1386, P1387: CMP (CYP) sensor

Possible Cause

Injector clogging, fuel leakage, air leakage

Injector circuit open or shorted

Injector resistor malfunction

Spark plug carbon deposits, fouling, malfunction

Ignition coil malfunction

ICM malfunction

Compression low

11-60
The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P1201 or P1301: Cylinder 1 mis-

fire detected.

The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P1202 or P1302: Cylinder 2 mis-

fire detected.

The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P1203 or P1303: Cylinder 3 mis-

fire detected.

The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P1204 or P1304: Cylinder 4 mis-

fire detected.

The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P1205 or P1305: Cylinder 5 mis-

fire detected.

The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P1206 or P1306: Cylinder 6 mis-

fire detected.
Misfire Detected in One CylinderProCarManuals.com

PGM-FI System

PCM Internal Circuit

The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P0607: A PCM Internal Circuit Failure.

— The MIL has been reported on.

— DTC P0607 is stored.

Problem verification:

1. Do the PCM Reset Procedure.

2. Turn the ignition switch ON (II).

3. Allow it to 3 seconds.

Is DTC P0607 indicated?

YES
Intermittent failure, system is OK

at this time.

Substitute a known-good PCM

and recheck. If symptom/indica-

tion goes away, replace the origi-

nal
PCM.

11-66ProCarManuals.com

Thermostat

The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P1486: Range/Performance Problem in

Thermostat.

NOTE: If the DTCs listed below are stored at the same time as DTC P1486, troubleshoot those DTCs first, then recheck for

P1486.

P0107, P0108, P1128, P1129: MAP Sensor

P2227, P2228, P2229: Barometric Pressure Circuit

P1259, P1279: VTEC system

P0401: EGR Flow Insufficient

P0404: EGR Valve Lift Insufficient

P0406: EGR Valve Position Sensor High Voltage

P0125, P0116, P0117, P0118: Engine Coolant Temperature Circuit

P0112, P0113: Intake Air Temperature Circuit

P0345, P0349, P1336, P1337: CKP Sensor 1/2

P0300: Random Misfire

P0301, P0302, P0303, P0304, P0305, P0306: Cylinder 1, 2, 3, 4, 5 or 6 Misfire detected.

P0506, P0507: Idle Control System Malfunction

P0511: Idle Air Control Valve

DTC P1486 can set occasionally when the hood is opened.

Troubleshooting

— The MIL has been reported on.

— DTC P1486 is stored.

1. Turn the ignition Switch OFF.

2. Check the engine coolant

level.

Is the engine coolant level low?

Does the radiator fan keep

running?

YES

Check the radiator fan circuit,

radiator fan switch circuit and

the radiator fan switch.

It they are OK, substitute the

PCM and recheck.

If the symptom/indication goes

away, replace the original PCM.
Refill the engine coolant. If neces-

sary, check the cooling system.

Test the thermostat.
Check for the radiator for circuit:

1. Turn the ignition switch ON

(II).

2. Check the radiator fan.ProCarManuals.com

The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P2228: A low voltage problem in the Baro

sensor circuit.

The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P2229: A high voltage problem in the Baro

sensor circuit.

The MIL has been reported on.

DTC P2228 or P2229 is stored.

Problem verification:

1. Do the PCM Reset Procedure.

2. Turn the ignition switch ON (II).

Is DTC P2229 indicated?

NO

Is DTC P2228 indicated?

YES

Substitute a known-good PCM

and recheck. If symptom/indica-

tion goes away, replace the origi-

nal
PCM.
Substitute a known-good PCM

and recheck. If symptom/indica-

tion goes away, replace the origi-

nal
PCM.

Intermittent failure, system is OK

at this time.ProCarManuals.com

Emission Control System

Exhaust Gas Recirculation (EGR) System (cont'd)

The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P0406: A high voltage problem in the

Exhaust Gas Recirculation (EGR) valve position sensor circuit.

— The MIL has been reported on.

— DTC P0406 is stored.

Problem verification:

1. Do the PCM Reset Procedure.

2. Turn the ignition switch ON (II).

Is DTC P0406 indicated?

YES

Check for an open in the EGR

valve position sensor:

1. Turn the ignition switch OFF.

2. Disconnect the EGR valve

position sensor connector.

3. Turn the ignition switch ON (II).

4. Measure voltage between the

EGR valve position sensor 3P

connector terminals No. 1 and

No. 3.

Is there about 5 V?

NO

Check for open in the wire (SG2

line):

Measure voltage between PCM

connector terminals D22 and D21.

Is there about 5 V?

NO

Substitute a known-good PCM

and recheck. If symptom/indica-

tion goes away, replace the origi-

nal
PCM.
NO
Intermittent failure, system is OK

at this time. Check for poor con-

nections or loose terminals at

C251, C254 (located at right shock

tower), C107 (EGR valve) and

PCM.

YES

Replace the EGR valve.

Repair open in the wire between

PCM (D22) and EGR valve posi-

tion sensor.

11-90ProCarManuals.com

Electrical Troubleshooting

Troubleshooting Flowchart — A/T Clutch Pressure Control Solenoid Valve

• OBD II Scan Tool indicates Code

P0748.

• Self-diagnosis indicator light

indicates Code 16.

Measure A/T clutch pressure con-

trol solenoid valve Resistance at

Solenoid Connector:

1. Disconnect the shift solenoid

valve/A/T clutch pressure con-

trol solenoid valve harness 4P

connector.

2. Measure the resistance of the

A/T clutch pressure control

solenoid valve.

Is the resistance approx. 5 ?

YES

Check A/T Clutch Pressure

Control Solenoid Valve for a

Short Circuit:

1. Disconnect the E (26P) con-

nector from the PCM.

2. Check for continuity between

body ground and the E16 termi-

nal and E3 terminal individually.

Is there continuity?

NO

Measure A/T Clutch Pressure

Control Solenoid Valve Resistance:

1. Connect the shift solenoid

valve/A/T clutch pressure con-

trol solenoid valve harness 4P

connector.

2. Measure the resistance

between the E16 and E3 ter-

minals.

Is the resistance approx. 5 ?

YES

Check the VB SOL Voltage:

1. Disconnect the A (26P) and E

(26P) connectors from the

PCM.

2. Turn the ignition switch ON (II).

3. Measure the voltage between

the E1 and A26 terminals.

Is there voltage?

YES

Check for loose PCM connectors.

If necessary, substitute a known-

good PCM and recheck.
Possible Cause

• Disconnected A/T clutch pres-

sure control solenoid valve con-

nector

• Short or open in A/T clutch

pressure control solenoid valve

wire

• Faulty A/T clutch pressure con-

trol solenoid valve

• Open VB SOL line

Replace the A/T clutch pressure

control solenoid valve.

Repair short in the wires

between the E16 and E3 termi-

nals and the A/T clutch pressure

control solenoid valve.

Repair loose terminal or open in

the wires between the E16 and E3

terminals and the A/T clutch pres-

sure control solenoid valve.

Check for open in the wire

between the E1 terminal and the

under-hood fuse/relay box.ProCarManuals.com

Disconnect the connectors from the unit

Cavity Wire Test condition
Test: Desired result
Possible cause if result is not obtained

A1

A7
BLK
Under all conditions
Check for continuity to ground:

There should be continuity.
• An open in the wire

Reconnect the connectors from the unit

Cavity Wire Test condition
Test: Desired result
Possible cause if result is not obtained

B2

B3

B4

B5

A12

A3

A9

A6

A10

A8

A5

A2

A4

B12

B14
BLU/YEL

YEL/GRN

ORN

WHT/GRN

BLU

PUR

ORN

ORN

BLU

BLK

ORN

GRN

PUR

PNK

GRN
Ignition switch in ACC (I)

Ignition switch in ACC (I)

With the ignition switch

OFF, press and hold the

"DOT" button. Turn the

ignition switch from OFF

to ACC three times and

back to ACC, then release

the "DOT" button.

Ignition switch in ACC (I)

Ignition switch in ACC (I)

Ignition switch turned

OFF

With the ignition switch

OFF, press and hold the

"DOT" button. Turn the

ignition switch from OFF

to ACC three times and

back to ACC, then release

the "DOT" button.

Ignition switch in ACC (I)

Under all conditions

Ignition switch in ACC (I)

Ignition switch in ACC (I)

OnStar "DOT" button

pushed

Ignition switch in ACC (I)

Ignition switch in ACC (I)

Ignition switch in ACC (I)

Ignition switch in ACC (I) On-

Star "DOT" button pushed

Ignition switch in ACC (I)
Check for voltage to ground:

There should be approx 8V.

Check for voltage to ground:

"DOT" button pushed: 280mV

"OnStar" button pushed: 1V

"Emergency" button pushed: 1.7V

Check for voltage to ground:

There should be 4V.

Check for voltage to ground:

There should be about 8V.

Check for voltage to ground:

There should be no voltage.

Check for voltage to ground:

There should be 10V.

Check for voltage to ground:

There should be 4V.

Check for voltage to ground:

There should be less than 1V.

Check for continuity to ground:

There should be continuity.

Check for voltage to ground:

There should be about 8V.

Check for voltage to ground:

There should be about 8V.

Check for voltage to ground:

There should be about 8V.

Check for voltage to ground:

There should be about 8V.

Check for voltage to ground:

"DOT" button pushed: 280mV

"OnStar" button pushed: 1V

"Emergency" button pushed: 1.7V

Check for voltage to ground:

There should be about 8V.

Check for voltage to ground:

There should be about 4V.
• Blown No. 56 (7.5 A) fuse in the

under-hood fuse/relay box

• An open in the wire

• Faulty OnStar button

• An open in the wire

• Faulty OnStar button

• An open in the wire

• Faulty OnStar button

• An open in the wire

• An open in the wire

• An open in the wire

• An open in the wire

• Poor ground (G401, G402)

• An open in the wire

• An open in the wire

• An open in the wire

• An open in the wire

• An open in the wire

• An open in the wire

• Faulty audio unit

• An open in the wire

• Faulty SRS unit

• An open in the wireProCarManuals.com

OnStar System

OnStar Buttons and Microphone Input Test

'03 Model

1. Pry off the OnStar buttons and microphone/homelink buttons.

2. Inspect the connector and socket terminals to be sure they are all making good contact.

• If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system.

• If the terminals look OK, make the following input tests at the connector.

— If any test indicates a problem, find and correct the cause, then recheck the system.

— If all the input tests prove OK, the switches and microphone must be faulty; replace it.

•: A3 and A4 terminals are microphone lines for navigation system.

ONSTAR BUTTONS AND MICROPHONE/

HOMELINK BUTTONS

Cavity Wire
Test condition
Test: Desired result

Possible cause if result is not obtained

A1

A2
WHT

BLK
Ignition switch in ACC

(II) OnStar "DOT" button

pushed. Speak into the

microphone.

Under all conditions
Check for voltage to ground:

There should be 4V.

Check for continuity go ground:

There should be continuity.
• An open in the wire

• An open in the wire

B1

B2

B3

B4

B5

B6
RED/BLK

YEL/GRN

BLU/YEL

WHT/GRN

ORN

BLK
Under all conditions

Ignition switch in ACC

(II)

Ignition switch in ACC

(II)

Ignition switch in ACC

(II)

With the ignition switch

OFF, press and hold the

"DOT" button. Turn the

ignition switch from OFF

to ACC three times and

back to ACC, then release

the "DOT" button.

Under all condition
Check for voltage to ground:

There should be battery voltage.

Check for voltage to ground:

"DOT" button pushed: 280 mV.

"OnStar" button pushed: 1 V.

"Emergency" button pushed: 1.7 V.

Check for voltage to ground:

There should be about 8 V.

Check for voltage to ground:

There should be about 8 V.

Check for voltage to ground:

There should be about 4 V.

Check for continuity go ground:

There should be continuity.
• An open in the wire

• An open in the wire

• An open in the wire

• An open in the wire

• An open in the wire

• An open in the wire

• Poor ground (G401)ProCarManuals.com