b. Turn key switch to START position.
Trucks without prelube system:
Measure 24V DC to ground on Circuit 21A
(TB25) and also 21B (TB31) to ground.
Trucks with prelube system:
Measure 24V DC to ground on Circuit 21A
@ TB25 and also 21PT @ TB28 to ground,
after the prelube system has reached
proper oil pressure. (Note: Engine oil level
must be correct.)
Verify digital input ENGSTRTREQ and digi-
tal outputs ENGCRANK, ENGCRNKX, and
BATSEPC are highlighted when 21A (&
21PT) and 21B are 24V DC.
6. Return key switch to ON position.
7. Move selector switch to FORWARD.
8. Turn key switch to START.
Circuit 21A should remain 0V DC.
9. Release key switch.
10. Place selector switch in NEUTRAL.
11. Place park brake switch in the OFF position.
12. Turn key switch to START position.
Circuit 21A should remain 0VDC.
13. Release the key switch.
14. Apply parking brake.
AUX ERROR CODE Check:
1. With the PTU still on the TCI Real Time Data
screen, check the AUX_ERROR_CODE at the
upper right of the screen:
Value should be blank or (001)
Note: Value will be (-01) if the TCI is not communicat-
ing with the aux inverter.
FIGURE 3-4. STATUS/WARNING LIGHTS
Row /
Column
Indicator Description Indicator Color
A1* Spare
B1* Low Steering Pressure Red
C1 Low Accumulator Precharge Red
D1 Spare
E1 Low Brake Pressure Red
A2* Low Hydraulic Tank Level Red
B2* Autolube Low Pressure Amber
C2* Circuit Breaker Tripped Amber
D2* Hydraulic Oil Filter Restricted Amber
E2* Low Fuel Amber
A3* Park Brake Applied Amber
B3* Service Brake Applied Amber
C3* Body Up Amber
D3* Dynamic Retarding Applied Amber
E3 STOP ENGINE Red
A4* Spare
B4* Manual Back-Up Lights Amber
C4* 5 Min. Shutdown Timer Amber
D4* Retard Speed Control Amber
E4* CHECK ENGINE Amber
A5 No Propel/Retard Red
B5 Propulsion System Caution Amber
C5 Propulsion Sys. Temp. Caution Amber
D5 High Brake/Hydraulic Oil Temp. Red
E5*
STOP ENGINE (Komatsu engine
only)
Red
A6 No Propel Red
B6 Propulsion System at Rest Amber
C6 Propulsion System Not Ready Amber
D6 Propel System at Reduced Level Amber
E6 Retard System at Reduced Level Amber
NOTE: On later model trucks, lamps indicated * can be dimmed
using dimmer control on Overhead Display Panel
E03015 3/01 AC Drive System Electrical Checkout Procedure E3-15
(Release 17 Software)
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