1991 ACURA NSX Service Repair Manual

Troubleshooting
Troubleshooting Procedure s
If th e inspectio n fo r a particula r cod e require s voltag e o r resistanc e check s a t th e EC M connectors , remov e th e bulkhea d
panels . Unbol t th e ECM . chec k th e syste m accordin g t o th e procedur e describe d fo r th e appropriat e code(s ) liste d o n th e
followin g pages .
ECM
BULKHEA D
PANEL S
How to Us e th e Backprob e Set s
Connec t th e backprob e adapter s t o th e stackin g patc h cords , an d connec t th e cord s t o a multimeter . Usin g th e wir e insula -
tio n a s a guid e fo r th e contoure d ti p o f th e backprob e adapter , gentl y slid e th e ti p int o th e connecto r fro m th e wir e sid e
unti l i t come s i n contac t wit h termina l en d o f th e wire .
DIGITA L MULTIMETE R
(Commerciall y available ) o r
KS - AH M - 32 - 00 3
STACKIN G PATC HCORD
BACKPROB E SE T07SA Z - 001000 A (tw o required ) BACKPROB E ADAPTE R
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CAUTION:

• Puncturing the insulation on a wire can cause poor or intermittent electrical connections.

• Bring the tester probe into contact with the terminal from the connector side of wire harness connectors in the engine

compartment. For female connectors, just touch lightly with the tester probe and do not insert the probe.

RUBBER SEAL
TESTER PROBE

WIRE HARNESS

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Troubleshooting
Troubleshooting Procedure s
Symptom Char t
Liste d belo w ar e symptom s an d probabl e cause s fo r problem s tha t D O NO T caus e th e Malfunctio n Indicato r Lam p (MIL ) t o
com e on .
I f th e MI L wa s reporte d on , g o t o pag e 11-38 .
Troubleshoo t eac h probabl e caus e in th e orde r liste d (fro m lef t t o right ) unti l th e sympto m is eliminated .
Th e probabl e caus e an d troubleshootin g pag e referenc e ca n b e foun d o n nex t page .
Troubleshoo t fo r misfir e o n page s 11-90 , 11-9 4
Othe r Probabl e Causes :
Engin e wil l no t star t
— Compressio n
— Engin e locke d u p
— Timin g bel t
— Startin g syste m
— Overheatin g
— Batter y
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11-61, 11-62
11-132 , 11-13 9
11-14 3
Sectio n 2 3
See DTC chart
See DTC chart
11-12 8
11-15 1
11-15 0
See DTC chart
See DTC chart
See DTC chart
11-121 , 11-12 4
11-126
11-14 9
11-15 4
11-159
11-16 7
Probabl
e Caus e Lis t
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Troubleshooting

Troubleshooting Procedures (cont'd)

ECM Data

By connecting the OBD-II scan tool or the Honda PGM Tester to the 16P data link connector (DLC), various data can be

retrieved from the ECM. The items listed in the table below conform to the SAE recommended practice.

The Honda PGM Tester also reads data beyond that recommended by SAE.

Understanding this data will help to find the causes of intermittent failures or engine problems.

NOTE:

• The "operating values" given below are approximate values and may be different depending on the environment and

the individual car.

• Unless noted otherwise, "at idle speed" means idling with the engine completely warmed up, A/T in or position,

M/T in neutral, and the A/C and all accessories turned off.ProCarManuals.com

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Troubleshooting

Engine Control Module Terminal Arrangement

ECM CONNECTOR A (26P)

ECM CONNECTOR A (26P)
TERMINAL SIDE OF MALE TERMINALS

NOTE: Standard battery voltage is 12 V.ProCarManuals.com

ECM CONNECTOR B (16P)

ECM CONNECTOR B (16P)
TERMINAL SIDE OF MALE TERMINALS

NOTE: Standard battery voltage is 12 V.

*: M/TProCarManuals.com