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For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 1999 🢒 Catera 🢒 DTC 🢒 DTC P1502 Theft Deterrent Fuel Enable Signal Not Received

Object Number: 611411 Size: SF
Engine Controls Components
Cell 20: Power, Ground, and MIL
OBD II Symbol Description Notice
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice

Circuit Description

This DTC sets if the ECM has not been programmed with the frequency code of the theft deterrent module, or if there is a fault in the circuit used for transmitting the data (the vehicle speed/theft deterrent signal circuit).

Conditions for Running the DTC

The engine is cranking.

Conditions for Setting the DTC

The ECM has not received the frequency code from the theft deterrent module.

Action Taken When the DTC Sets

The ECM will not illuminate the malfunction indicator lamp (MIL).

Conditions for Clearing the MIL/DTC
    • The DTC clears after forty consecutive warm-up cycles if no failures report by this diagnostic or any other non-emission related diagnostic.
    • The scan tool clears the MIL/DTC.

Diagnostic Aids

If the ECM and the theft deterrent module have not been properly programmed, this DTC may set and the vehicle will not start. Refer to Theft Deterrent System for programming instructions.

Notice: Using the J 35616-A Connector Test Adapter Kit will prevent damage to the harness connector terminals.

Use the J 35616 connector test adapter kit for any test that requires probing the ECM harness connector or a component harness connector.

Check for the following conditions:

    • Poor connections at the ECM or at the component--Inspect the harness connectors for a poor terminal to wire connection. Refer to Engine Control Module Diagnosis , Checking Terminal Contact, for the proper procedure.
    • Damaged harness--Inspect the wiring harness for damage. If the harness appears to be OK, observe the scan tool while moving the related connectors and the wiring harnesses. A change in the display may help locate the fault.

Refer to Symptoms for the Intermittents.

Test Description

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

  1. This step verifies whether or not the ECM is receiving vehicle speed data.

    2.

  2. The test lamp that is connected to B+ is used to simulate the B+ pull-up within the ECM. The DMM can be connected to the shaft of the test lamp and battery ground.

DTC P1502 - Theft Deterrent System - No Password Received

Step

Action

Value(s)

Yes

No

1

Did you perform the Powertrain On-Board Diagnostic (OBD) System Check?

--

Go to Step 2

Go to Powertrain On Board Diagnostic (OBD) System Check

2

  1. Turn OFF the ignition.

    2. Caution: Suitably chock the front wheels in order to prevent any unintended vehicle movement if only the rear of the vehicle is to be lifted in order to prevent vehicle damage and personal injury.

  2. Raise the vehicle in order to lift the drive wheels off the ground.
  3. Connect the scan tool.
  4. Turn ON the ignition.
  5. Shift the gear selector to Neutral.
  6. Rotate the left rear wheel by hand while observing the Vehicle Speed on the scan tool.

Does the scan tool indicate a vehicle speed above the specified value?

0.0 km/h (0.0 mph)

Go to Diagnostic Aids

Go to Step 3

3

  1. Turn OFF the ignition.
  2. Disconnect the ECM.
  3. Connect a test lamp from B+ to the vehicle speed/theft deterrent signal circuit in the ECM connector and leave the test lamp in place.
  4. Use a DMM set to AC, Hz, 400 mV scale, in order to measure the frequency between the vehicle speed/theft deterrent signal circuit in the ECM harness connector and ground.
  5. While monitoring the DMM, turn ON the ignition leaving the engine OFF.

Does the DMM momentarily indicate frequency within the specified range?

100-900 Hz

Go to Step 5

Go to Step 4

4
  1. Turn OFF the ignition.
  2. Disconnect the theft deterrent module harness connector.
  3. Check the vehicle speed/theft deterrent signal circuit for the following conditions:
    4. • An open circuit
    • A short to ground
    • A short to power
    • Refer to Wiring Repairs in Wiring Systems.

Did you find a problem?

--

Go to Step 6

Go to Step 7

5

  1. Turn OFF the ignition.
  2. Reconnect the ECM.
  3. Disconnect the theft deterrent module harness connector.
  4. Connect the J 38522 signal generator tester to the vehicle speed circuit in the theft deterrent module harness connector, one terminal connected to the signal circuit and the other terminal connected to ground.
  5. Turn ON the ignition.
  6. Turn ON the tester and set to 12 volt, 50 percent Duty Cycle, 600 Hz.

Does the scan tool indicate that the vehicle speed above the specified value?

0.0 km/h (0.0 mph)

Go to Step 7

Go to Step 8

6

Repair the vehicle speed/theft deterrent signal circuit between the theft deterrent module harness connector and the ECM. Refer to Wiring Repairs in Wiring Systems.

Is the action complete?

--

Go to Step 10

--

7

Check for a poor connection or poor terminal tension at the theft deterrent module harness connector. Refer to Wiring Repairs in Wiring Systems. Also, refer to Checking Terminal Contact in Engine Control Module Diagnosis .

Did you find and correct the problem?

--

Go to Step 10

Go to Diagnostic System Check - Theft Deterrent

8

Check for a poor connection or poor terminal tension at the ECM harness connector. Refer to Wiring Repairs in Wiring Systems. Also, refer to Checking Terminal Contact in Engine Control Module Diagnosis .

Did you find and correct the problem?

--

Go to Step 10

Go to Step 9

9

Important: This vehicle is equipped with a theft deterrent system that interfaces with the ECM. Program the new ECM with the frequency code of the theft deterrent module that is currently on the vehicle.

Replace the ECM. Refer to Engine Control Module Replacement/Programming .

Is the action complete?

--

Go to Step 10

--

10
  1. Using the scan tool, clear the DTCs.
  2. Start the engine.
  3. Allow the engine to idle until the engine reaches the normal operating temperature.
  4. Select DTC and the Specific DTC function.
  5. Enter the DTC number that was set.
  6. Operate the vehicle within the Conditions for Running this DTC until the scan tool indicates that the diagnostic Ran.

Does the scan tool indicate that the diagnostic Passed?

--

Go to Step 11

Go to Step 2

11

Does the scan tool display any additional undiagnosed DTCs?

--

Go to applicable DTC table

System OK