Circuit Description
Output Driver Modules (ODMs) are used by the PCM to turn on many of the current-driven devices that are needed to control various engine and Transaxle functions. Each ODM is capable of controlling up to 7 separate outputs by applying ground to the device which the PCM is commanding on. DTC P1652set indicates an improper voltage level has been detected, which controls the Fan 2 and Fan 3 relays.
Conditions for Running the DTC
The ignition is on.
Conditions for Setting the DTC
| • | An improper voltage level has been detected on the output circuit which controls the high speed fans. |
| • | The above conditions are present for at least 30 seconds. |
Action Taken When the DTC Sets
| • | The PCM will illuminate the malfunction indicator lamp (MIL) during the second consecutive trip in which the diagnostic test has been run and failed. |
| • | The PCM will store conditions which were present when the DTC set as Freeze Frame and Failure Records data. |
Conditions for Clearing the MIL/DTC
| • | The PCM will turn OFF the MIL during the third consecutive trip in which the diagnostic has been run and passed. |
| • | The History DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction. |
| • | The DTC can be cleared by using the scan tool. |
Diagnostic Aids
Check for the following conditions:
| • | Poor connection at PCM - Inspect harness connectors for the following items: |
| - | Backed out terminals |
| - | Improper mating |
| - | Broken locks |
| - | Improperly formed or damaged terminals |
| - | Poor terminal to wire connections |
| • | Damaged harness - Inspect the wiring harness for damage. |
| • | If the harness appears to be OK, disconnect the PCM, turn the ignition ON and observe a digital multimeter connected between the High speed fans control circuit and ground at the PCM harness connector while moving connectors and wiring harnesses related to the series/parallel fan relay and the high speed fan relay. A change in voltage will indicate the location of the fault. |
Review the Freeze Frame/Fail Records vehicle mileage since the diagnostic test last failed. This may help determine how often the condition that caused the DTC to be set occurs.
Test Description
Numbers below refer to the step numbers on the Diagnostic Table:
-
Normally, battery feed voltage should be present on the control circuit with the PCM disconnected and the ignition turned ON.
-
Checks for a shorted component or a short to battery positive voltage on the control circuit. Either condition would result in a measured current of over 500 milliamps. Also checks for a component that is going open while being operated, resulting in a measured current of 0 milliamps.
-
Checks for a short to battery positive voltage on the cooling fan relay #2 and #3 control circuit.
-
This vehicle is equipped with a PCM which utilizes an Electrically Erasable Programmable Read Only Memory (EEPROM). When the PCM is being replaced, the new PCM must be programmed. Refer to Powertrain Control Module Replacement/Programming .
Step | Action | Values | Yes | No | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
1 | Was the Powertrain On Board Diagnostic (OBD) System Check performed? | -- | ||||||||
Is the voltage near the specified value? | B+ | |||||||||
Does the current reading remain between the specified values? | 0.1 to 0.5 Amps (100 to 500 mA) | |||||||||
Is voltage at the specified value? | 0.0V | |||||||||
5 | Locate and repair the short to voltage in the fan 2 control circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | -- | |||||||
6 |
Is the fuse open? | -- | ||||||||
7 |
Did you complete the repair? | -- | -- | |||||||
8 |
Is voltage near the specified value? | B+ | ||||||||
9 |
Was a problem found? | -- | ||||||||
10 | Check for the following conditions:
Was a problem found? | -- | Go to Diagnostic Aids | |||||||
11 |
Does the test light flash ON and OFF? | -- | Go to Diagnostic Aids | |||||||
12 |
Was a problem found? | -- | ||||||||
13 | Locate and repair open in battery feed circuit to the cooling fan relays coil. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | -- | |||||||
14 |
Does the current reading remain below the specified value? | 0.25 Amp (250 mA) | ||||||||
|
Important: : The replacement PCM must be programmed. Replace the PCM. Refer to Powertrain Control Module Replacement/Programming . Did you complete the repair? | -- | -- | ||||||||
16 | Replace engine cooling fan relay #2. Did you complete the repair? | -- | -- | |||||||
17 | Replace engine cooling fan relay #3. Did you complete the repair? | -- | -- | |||||||
18 |
Does the scan tool indicate DTC P1652 failed this ignition? | -- | System OK |
