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. Unlike the Quad Driver Modules (QDMs) used in prior model years, ODMs have the capability of diagnosing each output circuit individually. DTC P1652 set indicates an improper voltage level has been detected on ODM B output 2, which controls the high speed and series/parallel cooling fan relays.
• | The ignition is ON. |
• | An improper voltage level has been detected on ODM B output 2 (the Fan 2 control circuit) |
• | The above conditions are present for at least 30 seconds. |
• | The PCM will illuminate the 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 Fail Records data. |
• | The PCM will turn the MIL OFF 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 Clear Info function or by disconnecting the PCM battery feed. |
Check for the following conditions:
• | Poor connection at the PCM. Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection. |
• | 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 Fan 2 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 malfunction. |
Reviewing the Fail Records vehicle mileage since the diagnostic test last failed may help determine how often the condition that caused the DTC to be set occurs. This may assist in diagnosing the condition.
Number(s) below refer to the step number(s) on the Diagnostic Table.
Ensures battery voltage is present on the High Speed Fans Control circuit with the PCM disconnected.
Checks for a short to B+ on the High Speed Fans Control circuit.
Checks for shorted relay coil(s). A shorted relay coil will result in a current reading higher than 1.5 amps.
If the current reading from step 4 is not within the specified range, this step determines which relay coil is internally shorted.
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.
Step | Action | Value(s) | Yes | No | ||||
---|---|---|---|---|---|---|---|---|
1 | Was the Powertrain On-Diagnostic System Check performed? | -- | ||||||
Is voltage near the specified value? | B+ | |||||||
Is voltage at the specified value? | 0V | |||||||
Does the current reading remain between the specified values? | 0.1-1.5 Amps | |||||||
Does the current reading remain between the specified values? | 0.1-1.5 Amps | |||||||
6 | Locate and repair short to voltage in the High Speed Fans control circuit. Refer to Repair Procedures in Electrical Diagnosis. Is action complete? | -- | -- | |||||
7 | Check the battery positive feed fuse for the Cool fan 2 and Cool Fan 3 relays. Is the fuse blown? | -- | ||||||
8 |
Is action complete? | -- | -- | |||||
9 |
Is voltage near the specified value? | B+ | ||||||
10 |
Was a problem found? | -- | ||||||
11 |
Was a problem found? | -- | ||||||
12 |
Does the test light flash ON and OFF? | -- | Refer to Diagnostic Aids | |||||
13 |
Was a problem found? | -- | ||||||
14 | Locate and repair the following circuit condition(s):
Refer to Repair Procedures in Electrical Diagnosis. Is action complete? | -- | -- | |||||
15 | Replace the Cool fan 3 relay. Is action complete? | -- | -- | |||||
16 | Replace the Cool Fan 2 Relay Is action complete? | -- | ||||||
Replace the PCM. Important: Replacement PCM must be programmed. Refer to Powertrain Control Module Replacement/Programming Is action complete? | -- | -- | ||||||
18 |
Note test result; does scan tool indicate DTC P1652 failed this ign? | -- | System OK |