Toyota T100 1996 Service Manual page 397

4. FAIL−SAFE CHART
If any of the following codes is recorded, the ECM enters fail−safe mode.
DTC No.
P0100 Ignition timing fixed at 10° BTDC
P0110 Intake air temp. is fixed at 20°C (68°F)
P0115 Engine coolant temp. is fixed at 80°(176°F)
P0120 VTA is fixed at 0°
P0135 Heater circuit in which an abnormality is detected is
P0141 turned off
P0325
Max. timing retardation
P0330
P1300 Fuel cut
5. CHECK FOR INTERMITTENT PROBLEMS
HINT:
TOYOTA HAND−HELD TESTER only:
By putting the vehicle's ECM in check mode, 1 trip detection logic is possible instead of 2 trip detection logic
and sensitivity to detect open circuits is increased. This makes it easier to detect intermittent problems.
(a) Clear the DTCs (See step 3).
(b) Set the check mode (See step 3).
(c) Perform a simulation test (See page IN−16).
(d) Check the connector and terminal (See page IN−26).
(e) Handle the connector (See page IN−26).
6. BASIC INSPECTION
When the malfunction code is not confirmed in the DTC check, troubleshooting should be performed in the
order for all possible circuits to be considered as the causes of the problems. In many cases, by carrying
out the basic engine check shown in the following flow chart, the location causing the problem can be found
quickly and efficiently. Therefore, use of this check is essential in engine troubleshooting.
1 Is battery positive voltage 11 V or more when engine is stopped?
1996 TOYOTA T100 (RM449U)
DIAGNOSTICS
(b) Clear the DTC.
The following actions will erase the DTCs and freezed
frame data.
(1)
(2)
NOTICE:
If the TOYOTA hand−held tester switches the ECM from
normal mode to check mode or vice−versa, or if the igni-
tion switch is turned from ON to ACC or OFF during check
mode, the DTCs and freezed frame data will be erased.
Fail−Safe Operation
NO
− ENGINE (5VZ−FE)
Operating the OBD II scan tool (complying with SAE
J1978) or TOYOTA hand−held tester to erase the
codes (See the OBD II scan tool's instruction book
for operating instructions.).
Disconnecting the battery terminals or EFI fuse.
Fail−Safe Deactivation Conditions
Returned to normal condition
Returned to normal condition
Returned to normal condition
Following condition must be repeated at least 2 times
consecutively
0.1 V x VTA x 0.95 V
Ignition switch OFF
Ignition switch OFF
IGF signal is detected for 6 consective ignitions
Charge or replace battery.
DI−133