Inspection Procedure

HINT:

• Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

• STP signal conditions can be checked using the intelligent tester.

(a)Connect the intelligent tester to the DLC3.

(b)Turn the ignition switch to the ON position.

(c)Turn the tester on.

(d)Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / STOP LIGHT SW.

(e)Check the STP signal when the brake pedal is depressed and released.

Brake Pedal Operation

Specified Condition

Depressed

STP signal ON

Released

STP signal OFF

CHECK STOP LIGHT SWITCH ASSEMBLY (TERMINAL B VOLTAGE)

(a) Disconnect the A19 stop light switch connector.

(b) Turn the ignition switch to the ON position.

(c) Measure the voltage between the terminals of the stop light switch connector and body ground.

Standard voltage

Tester Connection

Specified Condition

A19-2 (B) - Body ground

9 to 14 V

A19-3 (B) - Body ground

9 to 14 V

(d) Reconnect the stop light switch connector.

NGj>

Go to step 4

INSPECT STOP LIGHT SWITCH ASSEMBLY

(a) Remove the stop light switch assembly.

(b) Measure the resistance between the terminals. Standard resistance

Tester Connection

Switch Position

Specified Condition

1 - 2

Switch pin not pushed

Below 1 Q

Switch pin pushed

10 kQ or higher

3 - 4

Switch pin not pushed

10 kQ or higher

Switch pin pushed

Below 1 Q

(c) Reinstall the stop light switch assembly.

REPLACE STOP LIGHT SWITCH ASSEMBLY

CHECK ECM (STP AND ST1 - VOLTAGE)

Brake Pedal Depressed

Brake Pedal Released

Wire Harness Side:

(A2^ ECM Connector

ST1-

/.—

V-

Front View

(a) Disconnect the A24 ECM connector.

(b) Turn the ignition switch to the ON position.

(c) Measure the voltage between terminals ST1- and STP of the A24 ECM connector and body ground. Standard voltage

Tester Connection

Brake Pedal Operation

Specified Condition

A24-35 (ST1-) - Body ground

Released

9 to 14 V

Depressed

0 to 3 V

A24-36 (STP) - Body ground

Released

0 to 3 V

Depressed

9 to 14 V

(d) Reconnect the ECM connector.

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE ECM

INSPECT FUSE (STOP AND IGN FUSE)

Instrument Panel J/B:

STOP

(a) Remove the STOP and IGN fuses from the instrument panel J/B.

(b) Measure the resistance. Standard resistance:

Below 1 Q

(c) Reinstall the STOP and IGN fuses.

REPLACE FUSES (STOP AND/OR IGN FUSES)

REPAIR OR REPLACE HARNESS OR CONNECTOR

P0505

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

Don't pay hundreds of dollars to find out what is wrong with your car. This book is dedicated to helping the do it yourself home and independent technician understand and use OBD-II technology to diagnose and repair their own vehicles.

Get My Free Ebook


Post a comment