Pinpoint Test E: DTC B2A20 - Ignition Stuck In Start
Steering Column Switches
Pinpoint Tests
Pinpoint Test E: DTC B2A20 - Ignition Stuck in START
Refer to Wiring Diagram Set 13, Power Distribution/SJB for schematic and connector information. Diagrams By Number
Normal Operation
The ignition switch is spring loaded to automatically return to the RUN position after being placed in the START position. When the ignition switch is placed in START, fused ignition voltage is sent to:
- the control side of the run/start relay.
- the internal logic of the Smart Junction Box (SJB) for RUN circuit monitoring.
- the PCM and One-Touch Integrated Start (OTIS) diode on diesel engines with OTIS and on all gasoline engines.
- DTC B2A20 (Ignition Stuck in START) - The SJB continuously monitors the ignition switch state, if the SJB detects voltage on circuit CDC35 (BU/WH) or CDC38 (WH/VT) for more than 30 seconds, DTC B2A20 will be set.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Ignition switch
- SJB
PINPOINT TEST E: DTC B2A20 - IGNITION STUCK IN START
NOTICE: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.
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E1 CHECK THE IGNITION SWITCH MECHANICAL FUNCTION
- Inspect the ignition switch for mechanical function. Refer to the Component Test Ignition Switch - Mechanical. Component Tests and General Diagnostics
- Is the ignition switch OK?
Yes
GO to E2.
No
INSTALL a new ignition switch. REFER to Ignition Switch Ignition Switch. CLEAR the DTCs. REPEAT the self-test.
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E2 CHECK THE IGNITION SWITCH FOR A SHORT
- Carry out the Ignition Switch Component Test.
- Is the ignition switch OK?
Yes
GO to E3.
No
INSTALL a new ignition switch. REFER to Ignition Switch Ignition Switch. CLEAR the DTCs. REPEAT the self-test.
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E3 CHECK CIRCUIT CBP28 (GY/VT) FOR A SHORT TO VOLTAGE
- Connect: Ignition Switch C250.
- Disconnect: SJB Fuse 28 (5A).
- Ignition ON.
- Measure the voltage between SJB fuse 28 (5A), output side and ground.
- Is any voltage present?
Yes
GO to E4.
No
GO to E5.
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E4 ISOLATE THE ACM
- Ignition OFF.
- Disconnect: Audio Control Module (ACM) C240A.
- Ignition ON.
- Measure the voltage between SJB fuse 28 (5A), output side and ground.
- Is any voltage present?
Yes
REPAIR circuit CBP28 (GY/VT). CLEAR the DTC. REPEAT the self-test.
No
INSTALL a new ACM. REFER to Accessories and Optional Equipment. CLEAR the DTCs. REPEAT the self-test.
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E5 CHECK CIRCUITS CDC35 (BU/WH) AND CDC38 (WH/VT) FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: PCM C1232B (diesel engine).
- Disconnect: PCM C175T (gasoline engine).
- Disconnect: Starter Relay.
- Disconnect: OTIS Diode.
- Ignition ON.
- Measure the voltage between SJB fuse 28 (5A), input side and ground.
- Is any voltage present?
Yes
REPAIR circuit CDC35 (BU/WH) and/or CDC38 (WH/VT). CLEAR the DTCs. REPEAT the self-test.
No
GO to E6.
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E6 ISOLATE THE PCM
- Connect: PCM C1232B (diesel with OTIS).
- Connect: PCM C175T (gasoline engine).
- Measure the voltage between SJB fuse 28 (5A), input side and ground.
- Is any voltage present?
Yes
INSTALL a new PCM. REFER to Computers and Control Systems for gasoline engines and Computers and Control Systems for diesel engines. CLEAR the DTCs. REPEAT the self-test.
No
GO to E7.
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E7 ISOLATE THE STARTER RELAY
- Connect: Starter Relay.
- Measure the voltage between SJB fuse 28 (5A), input side and ground.
- Is any voltage present?
Yes
INSTALL a new starter relay. CLEAR the DTCs. REPEAT the self-test.
No
GO to E8.
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E8 CHECK THE OTIS DIODE FOR A SHORT OR AN OPEN
- Check the diode.
- Is the diode shorted or open?
Yes
INSTALL a new OTIS diode. CLEAR the DTCs. REPEAT the self-test.
No
GO to E9.
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E9 CHECK THE SJB CONNECTORS
- Disconnect: SJB C2280E.
- Check SJB connectors C2280B and C2280E for:
- corrosion.
- pushed-out pins.
- spread terminals.
- Connect: SJB C2280B.
- Connect: SJB C2280E.
- Make sure the connectors are seated correctly, then operate the system and verify the concern is still present.
- Is the concern still present?
Yes
INSTALL a new SJB. REFER to Body Control Systems. CLEAR the DTCs. REPEAT the self-test.
No
The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector.
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