Test Procedure

BB1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)

Are DTCs P0886, P0887, P2531, or P2533 present?

Yes	No
GO to BB2 .	If sent to this test from Pinpoint Test BC, GO to BB2 . For all others, GO to BB3.

BB2 CHECK THE BATTERY AND CHARGING SYSTEM

Check the battery and charging system voltages. Refer to the charging system article.

Are the battery and charging system voltages within specification?

Yes	No
GO to BB3 .	REPAIR as necessary. REFER to the charging system article. Clear the SOBDMC DTCs. REPEAT the self-test.

BB3 CHECK THE TCM POWER RELAY

Carry out the TCM power relay component test. Refer to the OEM Wiring Diagrams Component Testing article.

Does the TCM power relay pass the component test?

Yes	No
GO to BB4 .	INSTALL a new TCM Power relay. Clear the SOBDMC DTCs. REPEAT the self-test.

BB4 CHECK THE VOLTAGE TO THE TCM POWER RELAY

Ignition ON, engine OFF.

Measure the voltage between:

(+) TCM Power Relay Connector, Harness Side	(-)
B+ - Pin 1, 3	Ground

Is the voltage greater than 10.5 V?

Yes	No
GO to BB5 .	REPAIR the open circuit. Clear the SOBDMC DTCs. REPEAT the self-test.

BB5 CHECK THE TCMRC CIRCUIT FOR AN OPEN

Ignition OFF.
TCM-A connector disconnected.

Measure the resistance between:

(+) TCM Power Relay Connector, Harness Side	(-) TCM-A Connector, Harness Side
TCMRC - Pin 2	TCMRC - Pin 40

Is the resistance less than 5 ohms?

Yes	No
GO to BB6 .	REPAIR the open circuit. Clear the SOBDMC DTCs. REPEAT the self-test.

BB6 CHECK THE TCMRC CIRCUIT FOR A SHORT TO GROUND

Measure the resistance between:

(+) TCM-A Connector, Harness Side	(-)
TCMRC - Pin 40	Ground

Is the resistance greater than 10K ohms?

Yes	No
GO to BB7 .	REPAIR the short circuit. Clear the SOBDMC DTCs. REPEAT the self-test.

BB7 CHECK THE TCMRC CIRCUIT FOR A SHORT TO VOLTAGE

Ignition ON, engine OFF.

Measure the voltage between:

(+) TCM-A Connector, Harness Side	(-)
TCMRC - Pin 40	Ground

Is any voltage present?

Yes	No
REPAIR the short circuit. Clear the SOBDMC DTCs. REPEAT the self-test.	GO to BB8 .

BB8 CHECK FOR AN OPEN VPWR CIRCUIT BETWEEN THE TCM AND TCM POWER RELAY

Ignition OFF.

Measure the resistance between:

(+) TCM Power Relay Connector, Harness Side	(-) TCM-A Connector, Harness Side
VPWR - Pin 5	VPWR - Pin 10, 9

Are the resistances less than 5 ohms?

Yes	No
GO to BB9 .	REPAIR the open circuit. Clear the SOBDMC DTCs. REPEAT the self-test.

BB9 CHECK THE TCM POWER RELAY VPWR CIRCUIT FOR A SHORT TO VOLTAGE

Ignition ON, engine OFF.

Measure the voltage between:

(+) TCM Power Relay Connector, Harness Side	(-)
VPWR - Pin 5	Ground

Is any voltage present?

Yes	No
REPAIR the short circuit. Clear the SOBDMC DTCs. REPEAT the self-test.	GO to BB10 .

BB10 CHECK THE TCM VPWR CIRCUIT FOR A SHORT TO VOLTAGE

Ignition OFF.

Measure the voltage between:

(+) TCM-A Connector, Harness Side	(-)
VPWR - Pin 29	Ground

Is any voltage present?

Yes	No
REPAIR the short circuit. Clear the SOBDMC DTCs. REPEAT the self-test.	GO to BB11 .

BB11 CHECK FOR CORRECT TCM OPERATION

Ignition OFF.
Disconnect all the TCM connectors.
Visually inspect for:
- pushed out pins
- corrosion
Connect all the TCM connectors and make sure they seat correctly.
Carry out the SOBDMC self-test.
Verify the concern is still present.

Is the concern still present?

Yes	No
INSTALL a new TCM. REFER to the Automatic Transmission article. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) , Programming the TRID Block for a Replacement TCM.	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.