Starting System — 2016 workshop reference 683

DTC	Description	Fault Trigger Conditions
	P2535 Ignition Switch Run/Start Position Circuit High	The PCM sets this DTC when the PCM detects voltage on the crank detect circuit while engine is running.

DTC

Description

Fault Trigger Conditions

P2535 Ignition Switch Run/Start Position Circuit

High

The PCM sets this DTC when the PCM detects voltage on the crank detect circuit while engine is running.

Possible Sources

Ignition switch - push button start BCM PCM Wiring, terminals or connectors

PINPOINT TEST D : P2535

D1 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:

Click to display connectors

Positive Lead	Measurement / Action	Negative Lead
C175B-42		Ground

Is any voltage present?

Yes	GO to D2
No	GO to D4

D2 CHECK THE CRANK DETECT CIRCUIT FOR A SHORT TO VOLTAGE WITH THE IGNITION SWITCH - PUSH BUTTON START DISCONNECTED

Ignition OFF. Disconnect FCIM C2402A. Ignition ON. Measure:

Click to display connectors

Positive Lead	Measurement / Action	Negative Lead
C175B-42		Ground

Is any voltage present?

Yes	GO to D3
No	Install a new ignition switch - push button start. REFER to: Front Controls Interface Module (FCIM) (415-00A Information and Entertainment System - General Information - Vehicles With: AM/FM/CD/SYNC, Removal and Installation). (without touchscreen), or REFER to: Front Controls Interface Module (FCIM) (415-00B Information and Entertainment System - General Information - Vehicles With: Touchscreen Display, Removal and Installation). (with touchscreen)

Yes

GO to D3

Install a new ignition switch - push button start. REFER to: Front Controls Interface Module (FCIM) (415-00A Information and Entertainment System - General Information - Vehicles With: AM/FM/CD/SYNC, Removal and Installation). (without touchscreen), or REFER to: Front Controls Interface Module (FCIM) (415-00B Information and Entertainment System - General Information - Vehicles With: Touchscreen Display, Removal and Installation). (with touchscreen)

D3 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:

Click to display connectors

Positive Lead	Measurement / Action	Negative Lead
C175B-42		Ground

Is any voltage present?

Yes	REPAIR the circuit.
No	Click here to access Guided Routine (BCM).

Source reference 683

2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.