Dtc P242B: Exhaust Gas Temperature Sensor 1 Regulation Failure - Suzuki Grand Vitara 2011 Manual

DTC P242B: Exhaust Gas Temperature Sensor 1 Regulation Failure

CAUTION
!
This fault can result in a rapid and significant fouling of the diesel particulate filter.
NOTE
• Conditions for applying fault finding procedures to stored faults:
The fault becomes present if:
– The engine is started with a speed greater than 1750 rpm and a fuel flow greater than 30 mg/str.
– Or following a road test.
• If the fault is present:
– Diesel particulate filter regenerations are inhibited.
– The vehicle performances are reduced.
– The Injection warning light (gravity 1 warning light) is lit.
Wiring Diagram
For wiring circuit and connector number, refer to "A-5 Engine and A/C Control System Circuit Diagram (DSL) in
Section 9A".
Detecting Condition
Displaying on SUZUKI scan tool
D1
D2
Troubleshooting
Check the continuity, absence of interference resistance and insulation from +12 V of the following connection:
• Between "C73-1" wire of exhaust gas temperature sensor 1 connector and "C85-5" terminal of ECM
connector
• Between "C73-2" wire of exhaust gas temperature sensor 1 connector and "C85-22" terminal of ECM
connector
Repair if necessary.
Check the continuity, the absence of interference resistance and the insulation from vehicle body ground of the
following connection:
• Between "C73-1" wire of exhaust gas temperature sensor 1 connector and "C85-5" terminal of ECM
connector
Repair if necessary.
Check for the presence of ground on "C73-2" wire of the exhaust gas temperature sensor 1 connector.
Check the sensor resistance between "C73-1" and "C73-2" terminals of the connector according to parameter
"Turbo upst temp." on Data List of SUZUKI scan tool.
exhaust gas temperature sensor 1 resistance:
1572 – 1972 Ω at 400 °C, 752 °F
675 – 775 Ω at 500 °C, 932 °F
343 – 383 Ω at 600 °C, 1112 °F
197 – 217 Ω at 700 °C, 1292 °F
126 – 136 Ω at 800 °C, 1472 °F
84 – 94 Ω at 900 °C, 1652 °F
If the recorded values do not correspond to the above values, replace the exhaust gas temperature sensor 1.
If the fault is still present, substitute a known-good ECM and recheck.
Engine General Information and Diagnosis: For Diesel Engine Model 1A-356
Parameter at maximum limit
Temperature measured too high
Detecting condition
S6JB0A1124143