--
DIAGNOSTICS
ECD SYSTEM (1ND -- TV)
05 -- 91
COROLLA Supplement (RM1129E)
DTC P0234 TURBO/SUPER CHARGER OVERBOOST
CONDITION
DTC P0299 TURBO/SUPER CHARGER UNDERBOOST
CIRCUIT DESCRIPTION
Refer to DTC P0045 on page 05 -- 49
DTC No.
DTC Detection Condition
Trouble A reas
P0234
Actual turbocharger pressure higher than target pressure for
about 10 seconds
(The MIL i s illuminated as well as a DTC being set i mmediately
malfunction is detected)
S
VRV (Vacuum Regulating Valve)
S
Open or short i n V RV circuit
S
Turbocharger assembly
S
EGR v alve assembly
S
Intake shutter
S
Manifold absolute pressure sensor
S
Vacuum hose
S
ECM
P0299
Actual turbocharger pressure lower than target pressure for
about 10 seconds
(The MIL i s illuminated as well as a DTC being set i mmediately
malfunction is detected)
S
VRV (Vacuum Regulating Valve)
S
Open or short i n V RV circuit
S
Turbocharger assembly
S
EGR v alve assembly
S
Intake shutter
S
Manifold absolute pressure sensor
S
Vacuum hose
S
ECM
HINT:
These DTCs are set while steady speed driving with a highly engine load (at an engine speed of 3,000 rpm
or more)
WIRING DIAGRAM
Refer to DTC P0045 on page 05 -- 49 .
INSPECTION PROCEDURE
HINT:
Read freeze frame data using an intelligent tester ll. Freeze frame data record the engine condition when
malfunctions are detected. When troubleshooting, freeze frame data c an help determine if the v ehicle was
moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction oc -
curred.
1 CHECK OTHER DTC OUTPUT(IN ADDITION TO DTC P0234 AND/OR P0299)
(a) Connect an intelligent tester ll to the DLC3.
(b) Turn the ignition switch to ON and turn the intelligent tester ll ON.
(c)
Select the following menu items: Powertrain / Engine and ECT / DTC.
(d)
Read DTCs.
Result:
Display (DTC Output)
Proceed To
P0234 and/or P0299
A
P0234 and/or P0299 and other DTCs
B
B
GO TO RELEVANT DTC CHART
A
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TOYOTA COROLLA REPAIR MANUAL SUPP 1129E