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SHIFT POINT IS HIGH OR LOW [EV6A-EL, EV6AX-EL]

id0503n9101400

Troubleshooting item

Shift point is high or low

Description

•  Shift point considerably different from automatic shift diagram.

•  Shift delays when accelerating.

•  Shift occurs suddenly when accelerating and engine speed does not increase.

Possible cause

1.  Signal malfunction

―  APP sensor malfunction

―  BARO sensor malfunction

―  Brake switch malfunction

―  ECT sensor malfunction

―  IAT sensor No.1 malfunction

2.  Low-G (XY) sensor (built into sophisticated airbag sensor (SAS) control module) malfunction

Note

•  When driving on high-altitude roads, the TCM determines that the driving mode is the AAS mode, and may change to a different shift timing from the normal timing.

•  When SPORT mode is selected, a gear lower than NORMAL mode is selected, and the gear is maintained for a longer period of time. (with drive selection switch)

•  If the engine coolant temperature is low, a gear lower than when in NORMAL mode is selected.

System wiring diagram

•  Not applicable

Connector diagram

•  Not applicable

Troubleshooting item	Shift point is high or low
Description	• Shift point considerably different from automatic shift diagram. • Shift delays when accelerating. • Shift occurs suddenly when accelerating and engine speed does not increase.
Possible cause	1. Signal malfunction ― APP sensor malfunction ― BARO sensor malfunction ― Brake switch malfunction ― ECT sensor malfunction ― IAT sensor No.1 malfunction 2. Low-G (XY) sensor (built into sophisticated airbag sensor (SAS) control module) malfunction Note • When driving on high-altitude roads, the TCM determines that the driving mode is the AAS mode, and may change to a different shift timing from the normal timing. • When SPORT mode is selected, a gear lower than NORMAL mode is selected, and the gear is maintained for a longer period of time. (with drive selection switch) • If the engine coolant temperature is low, a gear lower than when in NORMAL mode is selected.
System wiring diagram	• Not applicable
Connector diagram	• Not applicable

Diagnostic Procedure

Step

Inspection

Results

Action

1

INSPECT SIGNAL PARTS FOR MALFUNCTION

•  Inspect the value at the following PCM PIDs using the M-MDS.
(See PID/DATA MONITOR INSPECTION.)

―  APP1 (APP sensor No.1)

―  APP2 (APP sensor No.2)

―  BARO (BARO sensor)

―  ECT (ECT sensor)

―  IAT1 (IAT sensor No.1)

•  Is there any malfunction?
(See PID/DATA MONITOR TABLE [PCM (SKYACTIV-G (E))].)

Yes

Repair or replace any malfunctioning parts according to the inspection result.

No

Go to the next step.

2

INSPECT SIGNAL PARTS FOR MALFUNCTION

•  Inspect the value at the following electrical supply unit (ESU) PIDs using the M-MDS.
(See PID/DATA MONITOR INSPECTION.)

―  BRK_SW (Brake switch)

•  Is there any malfunction?
(See PID/DATA MONITOR TABLE [ELECTRICAL SUPPLY UNIT (ESU) (E)].)

Yes

Repair or replace any malfunctioning parts according to the inspection result.

No

Go to the next step.

3

VERIFY IF MALFUNCTION CAUSE IS LOW-G (XY) SENSOR

•  Is there any malfunction?

Yes

Replace the sophisticated airbag sensor (SAS) control module.

(See SAS CONTROL MODULE REMOVAL/INSTALLATION [STANDARD DEPLOYMENT CONTROL SYSTEM].)

(See SAS CONTROL MODULE REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].)

No

Symptom troubleshooting is completed.

Step	Inspection	Results	Action
1	INSPECT SIGNAL PARTS FOR MALFUNCTION • Inspect the value at the following PCM PIDs using the M-MDS. (See PID/DATA MONITOR INSPECTION.) ― APP1 (APP sensor No.1) ― APP2 (APP sensor No.2) ― BARO (BARO sensor) ― ECT (ECT sensor) ― IAT1 (IAT sensor No.1) • Is there any malfunction? (See PID/DATA MONITOR TABLE [PCM (SKYACTIV-G (E))].)	Yes	Repair or replace any malfunctioning parts according to the inspection result.
1		No	Go to the next step.
2	INSPECT SIGNAL PARTS FOR MALFUNCTION • Inspect the value at the following electrical supply unit (ESU) PIDs using the M-MDS. (See PID/DATA MONITOR INSPECTION.) ― BRK_SW (Brake switch) • Is there any malfunction? (See PID/DATA MONITOR TABLE [ELECTRICAL SUPPLY UNIT (ESU) (E)].)	Yes	Repair or replace any malfunctioning parts according to the inspection result.
2		No	Go to the next step.
3	VERIFY IF MALFUNCTION CAUSE IS LOW-G (XY) SENSOR • Is there any malfunction?	Yes	Replace the sophisticated airbag sensor (SAS) control module. (See SAS CONTROL MODULE REMOVAL/INSTALLATION [STANDARD DEPLOYMENT CONTROL SYSTEM].) (See SAS CONTROL MODULE REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].)
3		No	Symptom troubleshooting is completed.