Hummer H3. Manual — part 1459

Conditions for Clearing the MIL/DTC

The PCM turns OFF the MIL during the third consecutive ignition cycles in which the
diagnostic test runs and passes.

A scan tool can clear the MIL/DTC.

The PCM clears the DTC from PCM history if the vehicle completes 40 warm-up cycles
without an emission-related diagnostic fault occurring.

The PCM cancels the DTC default actions when the fault no longer exists and the DTC
passes.

Diagnostic Aids

Ensure the VSS is correctly torqued to the transmission housing.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

3: This step tests the ability of the VSS to produce an AC voltage. This step also verifies the
integrity of the wiring to the PCM.

4: This step tests the VSS circuit for correct resistance.

DTC P0503

Step

Action

Value(s)

Yes

No

1

Did you perform the Diagnostic
System Check - Vehicle?

-

Go to Step 2

Go to
Diagnostic
System
Check -
Vehicle

1. Install a scan tool.

2. Turn ON the ignition, with

the engine OFF.

IMPORTANT:

Before clearing the DTC, use
the scan tool in order to
record the Freeze Frame and
Failure Records. Using the
Clear Info function erases the
Freeze Frame and Failure
Records from the PCM.

2007 Hummer H3

2007 TRANSMISSION Manual Transmission - Aisin AR5 - H3

2

3. Record the DTC Freeze

Frame and Failure Records.

4. Clear the DTC.

5. Raise and support the drive

wheels.

6. Start and idle the engine.

7. Engage the transmission in

2nd gear.

8. Select Vehicle Speed

Sensor on the scan tool.

With the drive wheels rotating,
does the VSS increase when the
wheel speed increases?

-

Go to Testing
for
Intermittent
Conditions
and Poor
Connections

Go to Step 3

3

1. Turn OFF the ignition.

2. Disconnect the PCM

connector C3.

3. Using the J 35616 GM

terminal test kit, connect
the DMM between the VSS
high signal circuit and the
VSS low signal circuit at
the PCM connector.

4. Select AC volts on the

DMM.

5. Turn ON the ignition, with

the engine OFF.

6. Rotate the right front drive

wheel by hand.

7. Observe the DMM display.

Can a voltage greater than the
specified value be obtained?

0.5 V AC

Go to Step 14 Go to Step 4

4

1. Leave the DMM test leads

connected.

2. Measure circuit resistance. 1,300-3,160

2007 Hummer H3

2007 TRANSMISSION Manual Transmission - Aisin AR5 - H3

Is the circuit resistance within the
specified range?

ohms

Go to Step 8 Go to Step 5

5

Is the circuit resistance greater
than the specified value?

3,160 ohms

Go to Step 11 Go to Step 6

6

1. Leave the DMM test leads

connected.

2. Disconnect the VSS

connector at the
transmission.

Is the circuit resistance less than
the specified value?

1,300 ohms

Go to Step 7

Go to Step

13

7

Test the high signal circuit and
the low signal circuit of the VSS
for being shorted together. Refer
to Circuit Testing and Wiring
Repairs .
Did you find and correct the
condition?

-

Go to Step 15

-

8

Test the high signal circuit of the
VSS for a short to ground. Refer
to Testing for Short to Ground
and Wiring Repairs .
Did you find and correct the
condition?

-

Go to Step 15 Go to Step 9

9

1. Connect PCM connector

C3.

2. Disconnect the VSS.

3. Select DC volts on the

DMM.

4. Using the J 35616 , connect

the DMM test leads to the
VSS high signal circuit and
the VSS low signal circuit
of the VSS wiring harness
connector.

5. Turn ON the ignition, with

-

2007 Hummer H3

2007 TRANSMISSION Manual Transmission - Aisin AR5 - H3

the engine OFF.

Does the DMM display system
voltage?

Go to Step 10

Go to Step

12

10

Test the high signal circuit of the
VSS for a short to voltage. Refer
to Testing for a Short to
Voltage and Wiring Repairs .
Did you find and correct the
condition?

-

Go to Step 15

-

11

1. Test the high signal circuit

of the VSS for an open.

2. Test the low signal circuit

of the VSS for an open.

Refer to Testing for Continuity
and Wiring Repairs .Did you
find and correct a condition?

-

Go to Step 15

Go to Step

13

12

1. Remove the VSS. Refer to

Vehicle Speed Sensor
Replacement.

2. Inspect the VSS and the

transmission for the
following conditions:

Incorrect VSS

VSS damage

Excessive VSS to
speed sensor rotor gap

Incorrect speed sensor
rotor alignment

Speed sensor rotor
damage

3. Repair any of the above

conditions as necessary.

Did you complete the repair?

-

Go to Step 15

-

Replace the VSS. Refer to

2007 Hummer H3

2007 TRANSMISSION Manual Transmission - Aisin AR5 - H3