Pinpoint Test C : P2535

WARNING: This page is about a different variant/trim than selected.

Refer to Starting System for schematic and connector information.

Normal Operation and Fault Conditions

When the ignition is turned to the START position the PCM receives a voltage signal on the crank detect circuit. When the required inputs have been received, the PCM supplies voltage and ground to the starter relay coil. Base audio systems receive the crank detect voltage to mute the system during cranking. A fault in the base ACM can cause a fault on the crank detect circuit.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
PCM P2535:00	Ignition Switch On/Start Position Circuit High: No Sub Type Information	This DTC is set when the PCM detects a short to voltage on the crank detect circuit while engine is running.

Possible Sources

Ignition switch
PCM
Wiring, terminals or connectors

Visual Inspection and Pre-checks

Verify the BCM fuse 3 (15A).

C1 CHECK FOR PCM (POWERTRAIN CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)
- Ignition ON.
- Using a diagnostic scan tool, perform PCM self-test.
Is PCM DTC P2535 present?

Yes GO to C2

No For all other PCM Diagnostic Trouble Codes (DTCs), REFER to PCM DTC Chart .

C2 CHECK THE CRANK DETECT CIRCUIT FOR A SHORT TO VOLTAGE WITH THE PCM (POWERTRAIN CONTROL MODULE) DISCONNECTED

Ignition OFF.

Disconnect PCM C175B.

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C175B-42	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes	With the base audio system, GO to C3 Without base audio system, GO to C4

GO to C6

C3 CHECK THE CRANK DETECT CIRCUIT FOR A SHORT TO VOLTAGE WITH THE ACM (AUDIO FRONT CONTROL MODULE) DISCONNECTED

Ignition OFF.

Disconnect ACM C240A.

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C175B-42	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes

GO to C4

No	REPLACE the ACM. REFER to: Audio Front Control Module (ACM) .

C4 CHECK THE CRANK DETECT CIRCUIT FOR A SHORT TO VOLTAGE WITH THE BCM (BODY CONTROL MODULE) DISCONNECTED

Ignition OFF.

Disconnect BCM C2280B.

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C175B-42	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes

GO to C5

No	INSTALL a new BCM. REFER to: Body Control Module (BCM) .

C5 CHECK THE CRANK DETECT CIRCUIT FOR A SHORT TO VOLTAGE WITH THE IGNITION SWITCH DISCONNECTED

Ignition OFF.

Disconnect Ignition switch C250.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C175B-42	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes	REPAIR the circuit.

No	INSTALL a new ignition switch. REFER to: Ignition Switch .

C6 CHECK FOR CORRECT PCM (POWERTRAIN CONTROL MODULE) OPERATION

Ignition OFF.

Disconnect and inspect all PCM connectors.

Repair:
- corrosion (install new connectors or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary

Reconnect the PCM connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes	CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this concern, DISCONTINUE this test and FOLLOW the TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, Refer to PCM Guided Routine Testing .

No	The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.