Parts for your 1999 Daihatsu Gran move-Power steering pump

1999 Daihatsu Gran Move power steering pump — what it does and how to look after it

Technical sources confirm the 1999 Daihatsu Gran Move (M100G/M110G) is fitted with a belt‑driven hydraulic power steering pump on models equipped with power steering. The Daihatsu/Toyota Electronic Parts Catalogue lists a vane‑type pump assembly, the factory workshop manual for M100/M110 covers pump service and bleeding procedures, and the owner’s manual includes routine checks for the power steering fluid reservoir—clear signs the pump is relevant to this vehicle.

• Daihatsu/Toyota Electronic Parts Catalogue (EPC) – Gran Move M100G/M110G: Pump Assy., Power Steering (vane type)
• Daihatsu Gran Move (M100/M110) Workshop Manual – Steering section (hydraulic system, pump service, bleeding)
• Daihatsu Gran Move Owner’s Manual – Maintenance checks for power steering fluid

The power steering pump on a 1999 Gran Move supplies hydraulic pressure to the rack-and-pinion, taking the hard yakka out of low‑speed manoeuvres and tight parking. It’s driven by the accessory belt, pulling fluid from the reservoir and pushing it through the steering gear, then back via the return line. When healthy, steering is light, consistent and quiet.

Good servicing keeps it that way. At each service interval, the fluid level and condition should be checked, clean, correct‑spec fluid is vital. Hoses, clamps and the pump body deserve a once‑over for weeps, and the drive belt needs the right tension and no cracking. Many techs recommend refreshing the fluid every couple of years or around 40,000–50,000 km, especially if it’s dark or smells burnt.

Common red flags include a whining noise that rises with engine revs, heavier steering at idle, notchy feel when parking, or visible leaks around the pump, pressure hose or reservoir. Belt squeal on full lock is another hint to inspect belt condition and tension. Left too long, aerated or contaminated fluid can knock off the pump and the steering rack, so early attention saves a fair whack.

Replacement is straightforward workshop fare: isolate, drain the system, remove the belt, disconnect lines, swap the pump with new O‑rings, refill with the specified fluid, then bleed by turning the wheel lock‑to‑lock (engine off, then running) while topping the reservoir. Avoid holding the wheel on the stops for more than a couple of seconds. Dispose of old fluid responsibly. In Australia and New Zealand, quality aftermarket or rebuilt pumps are readily available, and labour typically runs around an hour or two depending on access and seized fasteners.

• What power steering fluid should a 1999 Gran Move use?
  Most Gran Move systems of this era specify ATF‑type fluid (commonly Dexron II/III), but owners should confirm on the reservoir cap or in the owner’s manual. If the label is missing, a reputable workshop can verify by VIN and catalogue. Mixing fluid types isn’t ideal, so a full flush is smart when changing to the correct spec.
• How can someone tell if the Gran Move’s power steering pump is failing?
  Tell‑tales include a high‑pitched whine that follows engine revs, heavier or jerky steering at low speed, aerated or dark fluid in the reservoir, and leaks at the pump shaft or hose fittings. If the noise changes with steering input, it’s often pump or belt related, if it’s heavy one way only, the rack may be the culprit.
• Does the system need bleeding after pump replacement?
  Yes. After refilling with the correct fluid, the system should be bled by slowly turning the steering from lock to lock several times with the engine off, topping fluid as bubbles purge, then repeating with the engine idling. The goal is a quiet pump, steady fluid level and no foaming. Recheck the level after a short drive.