DTC P1655 Evaporative Emission (EVAP) Purge Solenoid Control Circuit. Pontiac Firebird 1997

For 1990-2009 cars only

Makes 🢒 Pontiac 🢒 1997 🢒 Firebird 🢒 DTC 🢒 DTC P1655 Evaporative Emission (EVAP) Purge Solenoid Control Circuit

Engine Controls Components
MAF Sensor, EVAP System, EGR Valve
OBD II Symbol Description Notice
Handling ESD Sensitive Parts Notice

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. Unlike the Quad Driver Modules (QDMs) used in prior model years, ODMs have the capability of diagnosing each output circuit individually. DTC P1655 set indicates an improper voltage level has been detected on ODM B output 5, which controls the EVAP purge valve.

Conditions for Setting the DTC

•	The ignition is ON.

•	An improper voltage level has been detected on ODM B output 5 (the EVAP purge valve driver circuit).

•	The above conditions are present for at least 30 seconds.

Action Taken When the DTC Sets

•	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.

Conditions for Clearing the MIL/DTC

•	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 Information function or by disconnecting the PCM battery feed.

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 voltmeter connected between the EVAP purge solenoid driver circuit and ground at the PCM harness connector while moving connectors and wiring harnesses related to the EVAP purge solenoid. A change in voltage will indicate the location of the fault.

Review the 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

Number(s) below refer to the step number(s) on the Diagnostic Table.

Normally, ignition 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 B+ on the control circuit. Either condition would result in a measured current of over 800 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 B+ on the EVAP purge solenoid 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.

DTC P1655 -- EVAP Purge Valve Control Circuit

Step

Action

Value(s)

Yes

Was the Powertrain On-Board Diagnostic (OBD) System Check performed?

Go to Step 2

Go to the Powertrain On Board Diagnostic (OBD) System Check

Turn OFF the ignition switch.
Disconnect the PCM.
Turn ON the ignition switch.
Using a J 39200 Digital Multimeter, measure voltage between the EVAP purge valve control circuit at the PCM harness connector and ground.

Is voltage near the specified value?

B+

Go to Step 3

Go to Step 6

Connect the digital multimeter to measure current between the EVAP purge valve control circuit at the PCM harness connector and ground.
Monitor the current reading on the digital multimeter for at least 2 minutes.

Does the current reading remain between the specified values?

0.05-0.8 amps

(50-800 mA)

Go to Step 11

Go to Step 4

Turn OFF the ignition switch.
Disconnect the EVAP purge valve (leave the PCM disconnected).
Turn ON the ignition switch.
Using the digital multimeter, measure voltage between the EVAP purge valve control circuit and ground.

Is voltage at the specified value?

Go to Step 10

Go to Step 5

Locate and repair short to voltage in the EVAP purge valve control circuit. Refer to Repair Procedures in Electrical Diagnosis.

Is action complete?

Go to Step 16

Check the ignition feed fuse for the EVAP purge valve.

Is the fuse open?

Go to Step 7

Go to Step 8

Locate and repair short to ground in ignition feed circuit for the EVAP purge valve. Refer to Fuse Block Details in Electrical Diagnosis.
Replace the fuse.

Is action complete?

Go to Step 16

Disconnect the EVAP purge solenoid.
Turn ON the ignition switch.
Measure voltage between the ignition feed circuit for the EVAP purge valve and ground.

Is voltage near the specified value?

B+

Go to Step 9

Go to Step 13

Check the EVAP purge valve control circuit for an open or a short to ground.
If a problem is found, repair the EVAP purge valve control circuit. Refer to Repair Procedures in Electrical Diagnosis.

Was a problem found?

Go to Step 16

Go to Step 10

Check for the following conditions:

•	The EVAP purge valve control circuit for a poor connection at the PCM.

•	The EVAP purge valve control circuit for a poor connection at EVAP purge valve.

•	The EVAP purge valve ignition feed circuit for a poor connection at the EVAP purge valve.

If a problem is found, replace faulty terminal(s) as necessary. Refer to Repair Procedures in Electrical Diagnosis.

Was a problem found?

Go to Step 16

Go to Step 14

Turn OFF the ignition switch.
Reconnect the PCM.
Disconnect the EVAP purge valve.
Turn ON the ignition switch.
Connect a J 35616-200 Unpowered Test Light between the EVAP purge valve control circuit and the ignition feed circuit at the EVAP purge valve harness connector.
Using the scan tool outputs test function, cycle the EVAP purge valve output ON and OFF.

Does the test light flash ON and OFF?

Go to Diagnostic Aids

Go to Step 12

Check the EVAP purge valve control circuit for a poor connection at the PCM.
If a problem is found, replace faulty terminal. Refer to Repair Procedures in Electrical Diagnosis.

Was a problem found?

Go to Step 16

Go to Step 15

Locate and repair open in ignition feed circuit to the EVAP purge valve. Refer to Repair Procedures in Electrical Diagnosis.

Is action complete?

Go to Step 16

Replace the EVAP purge valve. Refer to Evaporative Emission Canister Purge Solenoid .

Is action complete?

Go to Step 16

Replace the PCM.

Important:: Replacement PCM must be programmed. Refer to Powertrain Control Module Replacement/Programming .

Is action complete?

Go to Step 16

Review and record scan tool Fail Records data.
Clear DTCs.
Operate the vehicle within Fail Records conditions as noted.
Using a scan tool, monitor Specific DTC info for DTC P1655 until the DTC P1655 test runs.

Note test result; does scan tool indicate DTC P1655 failed this ign?

Go to Step 2

System OK