Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Celica 1988-1989.1993-1994.2000 Approved Toyota Celica 1994 G tests with codes 2.2L
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G - TESTS W/CODES - 2.2L
1994 Toyota Celica
1994 ENGINE PERFORMANCE
Toyota 2.2L Self-Diagnostics
Celica
INTRODUCTION
If no faults were found while performing F - BASIC TESTING,
proceed with self-diagnostics. If no Diagnostic Trouble Codes (DTC)
are present after entering self-diagnostics, proceed to steps in
H - TESTS W/O CODES article for diagnosis by symptom (i.e., ROUGH
IDLE, NO START, etc.).
NOTE: Diagnostic Trouble Codes (DTC) will be referred to as
trouble codes in this article.
SELF-DIAGNOSTIC SYSTEM
Hard Failures
Hard failures cause Malfunction Indicator Light (MIL) on
instrument panel to illuminate and remain on until problem is
repaired. If light comes on and remains on (light may flash) during
vehicle operation, corresponding trouble code will be retained in
Electronic Control Module (ECM) memory on some trouble code
applications. Not all trouble codes are retained in ECM memory. The
cause of malfunction must be determined using trouble code charts. If
a sensor fails, Electronic Control Module (ECM) will use a substitute
value in its calculations to continue engine operation. In this
condition, commonly known as limp-in mode, the vehicle runs but
driveability will not be optimum.
NOTE: The MIL may also be referred to as the CHECK ENGINE light.
The MIL may not illuminate when certain failure such as
faulty starter signal or A/C switch signal exists, or if
certain trouble codes are set.
Intermittent Failures
Intermittent failures may cause Malfunction Indicator Light
(MIL) to flicker or illuminate and go out after intermittent fault
goes away. However, the corresponding trouble code will be retained in
ECM memory on some trouble code applications. Not all trouble codes
are retained in ECM memory. Intermittent failures may be caused by a
sensor, connector or wiring related problem. See INTERMITTENTS in
H - TESTS W/O CODES article.
NOTE: Test Mode (if equipped) and Normal Mode on self-diagnostic
system are used for retrieving trouble code from ECM memory.
For information on different mode usage, see RETRIEVING
TROUBLE CODES.
RETRIEVING TROUBLE CODES
NOTE: Trouble codes may be retrieved using Toyota scan tester in
Normal Mode or Test Mode.
NOTE: Normal Mode is used to retrieve trouble code from Electronic
Control Module (ECM) to determine problem area. Test Mode is
used to check for trouble codes when operating vehicle to
simulate conditions in which trouble code was set. Test mode
contains a higher sensing ability to detect malfunctions.
Test Mode helps determine malfunctions caused by poor
electrical connections, which are difficult to determine
using Normal Mode. Test Mode also checks for malfunction in
starter signal circuit, A/C switch signal and Park/Neutral
switch signal.
NOTE: The Malfunction Indicator Light (MIL) on the instrument
panel may also be referred to as CHECK ENGINE light.
Toyota Scan Tester
Connect scan tester to appropriate Data Link Connector (DLC).
See Fig. 1. DLC No. 1 is used on all models. Using scan tester
manufacturer's instructions, retrieve trouble codes.
Normal Mode
1) Before retrieving trouble code(s), verify MIL on
instrument panel comes on with ignition on and engine off. The MIL
should go off when engine is started.
2) If MIL does not come on with ignition on and engine off,
check bulb circuit on instrument panel and wiring circuit between MIL
and ECM. See appropriate wiring diagram in L - WIRING DIAGRAMS
article. See ECM LOCATION.
3) If MIL remains on, self-diagnostic system has detected a
malfunction or abnormality. Ensure battery voltage is greater than 11
volts and charging system is okay. Warm engine to normal operating
temperature.
4) Apply parking brake. Shift the transmission/transaxle into
Neutral (M/T) or Park (A/T). Turn A/C and all accessories off. Ensure
throttle is in idle position.
5) Turn ignition on with engine off. Install Jumper Wire (SST
09843-18020) between terminals TE1 and E1 in appropriate Data Link
Connector (DLC). See Fig. 1.
6) Count number of flashes from MIL on instrument panel. If
system is operating properly (with no trouble codes), MIL will flash
continuously and evenly. See Fig. 2.
7) If MIL will not flash, check TE1 and E1 wiring circuit.
See appropriate TE1 & TE2 DIAGNOSTIC CIRCUIT CHECK chart under TROUBLE
CODE CHARTS. See ECM LOCATION.
8) If trouble code exists, digits of trouble code will be
flashed at approximately 1/2-second intervals. A 1 1/2-second pause
separates first and second digits of code. See Fig. 2.
9) If more than one trouble code is stored, a 2 1/2-second
pause will occur before next trouble code is flashed. Once all trouble
codes are displayed, a 4 1/2-second pause will occur then trouble
code(s) will be repeated.
10) Trouble codes are displayed in order of smallest to
largest. After trouble codes are retrieved, remove jumper wire to exit
Normal Mode. See NOTES ON TROUBLE CODES. For additional information on
trouble codes, see TROUBLE CODE DIAGNOSTIC HINTS table under SELF-
DIAGNOSTIC SYSTEM and appropriate TROUBLE CODE IDENTIFICATION table
under TROUBLE CODE IDENTIFICATION.
NOTE: To repair failure causing trouble code, refer to proper
trouble code chart under TROUBLE CODE CHARTS. Once repairs
for trouble code are made, trouble code must be cleared from
ECM memory. See CLEARING TROUBLE CODES.
Test Mode
1) Before retrieving trouble code(s), verify MIL on
instrument panel comes on with ignition on and engine off. The MIL
should go off when engine is started.
2) Check bulb circuit on instrument panel and wiring circuit
between MIL and ECM. See appropriate wiring diagram information in
L - WIRING DIAGRAMS article. See ECM LOCATION.
3) Ensure battery voltage is greater than 11 volts and
charging system is okay. Apply parking brake. Shift the
transmission/transaxle to Neutral (M/T) or Park (A/T). Turn A/C and
all accessories off. Ensure throttle is in idle position and ignition
is off.
NOTE: Test Mode will not operate if jumper wire is installed
between terminals TE2 and E1 in Data Link Connector (DLC)
after ignition is turned on.
4) Install Jumper Wire (SST 09843-18020) between terminals
TE2 and E1 in Data Link Connector (DLC) with ignition off. See Fig. 1.
5) Turn ignition on with engine off. Test Mode is operational
if MIL on instrument panel flashes.
6) If MIL fails to flash, check TE2 wiring circuit. See
appropriate TE1 & TE2 DIAGNOSTIC CIRCUIT CHECK chart under TROUBLE
CODE CHARTS. See ECM LOCATION.
7) Drive vehicle at a speed greater than 6 MPH. ECM will set
Trouble Codes 42 and 43 if vehicle is not driven. Try to simulate
conditions of driveability complaint described by customer, and note
when MIL comes on. This indicates when problem exists.
8) Stop vehicle, but DO NOT turn engine off. Install jumper
wire between terminals TE1 and E1 in DLC. See Fig. 1. Count number of
flashes from MIL on instrument panel. If system is operating properly
(with no trouble codes), MIL will flash continuously and evenly. See
Fig. 2.
9) If trouble code exists, digits of trouble code will be
flashed at approximately 1/2-second intervals. A 1 1/2-second pause
separates first and second digits of code. See Fig. 2.
10) If more than one trouble code is stored, a 2 1/2-second
pause will occur before next trouble code is flashed. Once all trouble
codes are displayed, a 4 1/2-second pause will occur, then trouble
code(s) will be repeated. Trouble codes are displayed in order of
smallest to largest.
NOTE: On all models, Trouble Code 51 will normally be displayed if
automatic transmission/transaxle is in any gear except Park
or Neutral, A/C is turned on, or accelerator pedal is
depressed.
11) After trouble code(s) is retrieved, remove jumper wires
to exit Test Mode. See NOTES ON TROUBLE CODES. For additional
information on trouble codes, see TROUBLE CODE DIAGNOSTIC HINTS table
under SELF-DIAGNOSTIC SYSTEM and appropriate TROUBLE CODE
IDENTIFICATION table under TROUBLE CODE IDENTIFICATION.
NOTE: The MIL may not come on if certain trouble code is set when
in Test Mode. See appropriate TROUBLE CODE IDENTIFICATION
table under TROUBLE CODE IDENTIFICATION.
NOTE: To repair failure causing trouble code, refer to proper
trouble code chart under TROUBLE CODE CHARTS. Once repairs
for trouble code are made, trouble code must be cleared from
ECM memory. See CLEARING TROUBLE CODES.
Fig. 1: Data Link Connector ID & Installing Jumper Wire (Celica)
Courtesy of Toyota Motor Sales, U.S.A., Inc.
Fig. 2: Identifying Normal System Operation & Trouble Code Using MIL
Courtesy of Toyota Motor Sales, U.S.A., Inc.
NOTES ON TROUBLE CODES
1) When certain trouble codes occur, MIL on instrument panel
will not come on. For designation of MIL operation on certain trouble
codes, see appropriate TROUBLE CODE IDENTIFICATION table under TROUBLE
CODE IDENTIFICATION.
2) When certain malfunctions or trouble codes initially
occur, they will be temporarily stored in ECM memory, but MIL on
instrument panel will not come on.
3) The second time malfunction or trouble code is detected,
MIL on instrument panel will then come on, provided ignition is turned
off and then back on after malfunction or trouble code was first
detected. This is referred to as the Two Trip Detection Logic and only
applies to specified trouble codes. See TWO TRIP DETECTION LOGIC
TROUBLE CODES table.
NOTE: When road testing vehicle in Test Mode, the Two Trip
Detection Logic will not function. In Test Mode, the MIL on
instrument panel will come on the first time malfunction or
trouble code is detected.
TWO TRIP DETECTION LOGIC TROUBLE CODES TABLE
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