Honda CBR650RA Shop Manual page 148

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PGM-FI SYSTEM
DTC P2158
Probable cause:
• Faulty rear wheel speed sensor or its related circuit
• ABS modulator has DTC (CAN lines included)
• Faulty ECM
Symptom/Fail-safe function:
• Engine operates normally
• When other DTC is displayed, together with P0500,
troubleshoot it first.
1. Rear Wheel Speed Sensor Signal Output Line
Open Circuit Inspection
Turn the ignition switch OFF.
Disconnect the following:
– ABS modulator 18P (Black) connector (page 19-
26)
– ECM 33P (Black) connector (page 4-76)
Check for continuity between the wire harness side
ABS modulator 18P (Black) connector [1] and ECM
33P (Black) connector [2].
TOOL:
Test probe
CONNECTION: Black/blue – Black/blue
Is there continuity?
YES
NO
2. Rear Wheel Speed Sensor Signal Output Line
Short Circuit Inspection
Check for continuity between the wire harness side
ECM 33P (Black) connector [1] and ground.
TOOL:
Test probe
CONNECTION: Black/blue – Ground
Is there continuity?
YES
NO
3. ECM Inspection
Replace the ECM with a new one (page 4-76).
Erase the DTC (page 4-9).
Perform the test-ride the motorcycle (page 4-14).
Check the DTC with the GST or MCS.
Is same DTC indicated?
YES
NO
4-44
07ZAJ-RDJA110
– GO TO STEP 2.
– Open circuit in the Black/blue wire
07ZAJ-RDJA110
– Short circuit in the Black/blue wire
– GO TO STEP 3.
– Replace the ABS modulator with a known
good one and recheck (page 19-26).
– Faulty original ECM.
[1]
Bl/Bu
(Terminal side of the wire harness)
[1]
Bl/Bu
(Terminal side of the wire harness)
[2]
Bl/Bu